Garmin 188, 238 User Manual

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GPSMAP 188/188C/238 Sounder

chartplotting receiver & depth-ﬁ nder

owner’s manual and reference

(GPSMAP 188C Shown)

guide

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Garmin International, Inc. 1200 East 151st Street, Olathe, KS 66062, U.S.A. Tel. 913/397.8200 or 800/800.1020 Fax 913/397.8282

Garmin (Europe) Ltd. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey SO51 9DL, U.K. Tel. 44/1794.519944 Fax 44/1794.519222

Garmin Corporation No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan Tel. 886/2.2642.9199 Fax 886/2.2642.9099

All Rights Reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual and of any revision of this manual onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or any revision hereto, provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.

Information in this manual is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes. Visit the Garmin web site (www.garmin.com) for current updates and supplemental information concerning the use and operation of this and other Garmin products.

GARMIN®, AutoLocate®, GPSMAP®, See-Thru®, DCG (Depth Control Gain)®, MapSource®, BlueChart®, and TracBack® are registered trademarks of Garmin Ltd. or its subsidiaries and may not be used without the express permission of Garmin.

June 2003 Part Number 190-00216-10 Rev. A Printed in Taiwan

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Preface

Congratulations on choosing one of the most advanced marine navigation systems available! The Garmin GPSMAP tured mapping to create an unsurpassed marine navigation chartplotters.

This manual covers instructions for the GPSMAP 188, GPSMAP 188C (color), and GPSMAP 232.

Unit operation and speciﬁ cations will be the same on all three models, unless otherwise speciﬁ ed. To get the most out of your new navigation system, take the time to go through this owner’s manual

and learn the operating procedures for your unit. This manual is broken down into two parts for your convenience.

Part One introduces you to the GPSMAP 188/188C/238 Sounder and provides a Getting Started tour so that you may become more familiar with the unit. This section will provide you with a basic working knowledge necessary to use the unit to its fullest potential.

Part Two is divided into sections that provide detailed references to the advanced features and operations of the GPSMAP 188/188C/238 Sounder. This allows you to concentrate on a speciﬁ c topic quickly

and look up detailed information about the GPSMAP 188/188C/238 Sounder.

Customer Service Product Registration

Help us better support you by completing our on-line registration today!

Have the serial number of your GPSMAP 188/188C/238 handy and connect to our web site (www.garmin.com). Look for the Product Registration link on the Home page. Also, be sure to record your serial number in the area provided on page iv of this manual.

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188/188C/238 Sounders utilize the proven performance of Garmin GPS and full fea-

NOTE: If you have previously registered a Garmin product purchase, we invite you to re-register using our NEW on-line system. Many services provided by our new product registration system are now being automated and re-registering your purchase ensures you the best possible support from Garmin.

Introduction

Preface and

Registration

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Introduction

FCC Compliance

The GPSMAP 188/188C/238 Sounder complies with Part 15 of the FCC interference limits for Class B digital devices FOR HOME OR OFFICE USE. These limits are designed to provide more reasonable protection against harmful interference in a residential installation, and are more stringent than “outdoor” requirements.

Operation of this device is subject to the following conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and the receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or and experienced radio/TV technician for help.

The GPS 188C Sounder does not contain any user-serviceable parts. Repairs should only be made by an authorized Garmin service center. Unauthorized repairs or modiﬁ cations could result in permanent damage to the equipment, and void your warranty and your authority to operated this device under Part 15 regulations.

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The GPS system is operated by the United States government, which is solely responsible for its accuracy and maintenance. The system is subject to changes which could affect the accuracy and performance of all GPS equipment. Although the Garmin GPSMAP 188/188C/238 is a precision electronic NAVigation AID (NAVAID), any NAVAID can be misused or misinterpreted and, therefore, become unsafe.

Introduction

Warnings and Cautions

The electronic chart is an aid to navigation and is designed to facilitate the use of authorized government charts, not replace them. Only ofﬁ cial government charts and notices to mariners contain all information needed for safe navigation – and, as always, the user is responsible for their prudent use.

Use the GPSMAP 188/188C/238 at your own risk. To reduce the risk of unsafe operation, carefully review and understand all aspects of this Owner’s Manual—and thoroughly practice operation using the simulator mode prior to actual use. When in actual use, carefully compare indications from the GPSMAP 188/188C/238 to all available navigation sources, including the information from other NAVAIDs, visual sightings, charts, etc. For

safety, always resolve any discrepancies before continuing navigation.

FCC Compliance

MAP DATA INFORMATION: One of the goals of Garmin is to provide customers with the most complete and accurate cartography that is available to us at a reasonable cost. We use a combination of governmental and private data sources, which we identify (as required) in product literature and copyright messages displayed to the consumer. Virtually all data sources contain inaccurate or incomplete data to some degree. This is particularly true outside the United States, where complete and accurate digital data is either not available or prohibitively expensive.

The GPSMAP 188/188C/238 complies with Part 15 of the FCC interference limits for Class B digital devices FOR HOME OR OFFICE USE. These limits are designed to provide reasonable protection against harmful interference in a residential installation, and are more stringent than “outdoor” requirements. Operation of this device is subject to the following conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee

CAUTION: IT IS THE USER’S RESPONSIBILITY TO USE THIS PRODUCT PRUDENTLY. THIS PRODUCT IS INTENDED TO BE USED ONLY AS A NAVIGATIONAL AID AND MUST NOT BE USED FOR ANY PURPOSE REQUIRING PRECISE MEASUREMENT OF DIRECTION, DISTANCE, LOCATION, OR TOPOGRAPHY.

that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help.

The GPSMAP 188/188C/238 does not contain any user-serviceable parts. Repairs should only be made by an authorized Garmin service center. Unauthorized repairs or modiﬁ cations could result in permanent damage

WARNING: This product, its packaging, and its components contain chemicals known to the State of California to cause cancer, birth defects, or reproductive harm. This Notice is being provided in accordance with California’s Proposition 65. If you have any questions or would like additional information, please refer to our web site at http: //www.garmin.com/prop65.

to the equipment, and void your warranty and your authority to operate this device under Part 15 regulations.

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Introduction

Warranty and

Serial Number

Use this area to record the serial number (8-digit number located on the back of the unit) in case it is lost, stolen, or needs service. Be sure to keep your original sales receipt in a safe place or attach a photocopy inside the manual.

Serial Number:

The GPSMAP 188/188C/238 Sounder is fastened shut with screws. Any attempt to open the case to change or modify the unit in any way will void your warranty and may result in permanent damage to the equipment.

LIMITED WARRANTY

This Garmin product is warranted to be free from defects in materials or workmanship for one year from the date of purchase. Within this period, Garmin will at its sole option, repair or replace any components that fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts or labor, provided that the customer shall be responsible for any transportation cost. This warranty does not cover failures due to abuse, misuse, accident or unauthorized alteration or repairs.

THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED OR STATUTORY, INCLUDING ANY LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE.

IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE, OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do not allow the exclusion of incidental or consequential damages, so the above limitations may not apply to you.

Garmin retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.

To obtain warranty service, contact your local Garmin authorized dealer. Or call Garmin Customer Service at one of the numbers shown below, for shipping instructions and an RMA tracking number. The unit should be securely packed with the tracking number clearly written on the outside of the package. The unit should then be sent, freight charges prepaid, to any Garmin warranty service station. A copy of the original sales receipt is required as the proof of purchase for warranty repairs.

Products sold through online auctions are not eligible for rebates or other special offers from Garmin. Online auction conﬁ rmations are not accepted for warranty veriﬁ cation. To obtain warranty service, an original or copy of the sales receipt from the original retailer is required. Garmin will not replace missing components from any package purchased through an online auction. Garmin International, Inc. Garmin (Europe) Ltd. 1200 East 151st Street Unit 4, The Quadrangle, Abbey Park Industrial Estate Olathe, Kansas 66062, U.S.A. Romsey, SO51 9DL, U.K. Phone: 913/397.8200 Phone: 44/1794.519944 USA Only: 800/800.1020 FAX: 44/1794.519222 FAX: 913/397.0836

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Software License Agreement

BY USING THE GPSMAP 188/188C/238, YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS OF THE FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREEMENT CAREFULLY.

Garmin grants you a limited license to use the software embedded in this device (the “Software”) in binary executable form in the normal operation of the product. Title, ownership rights and intellectual property rights in and to the Software remain in Garmin.

You acknowledge that the Software is the property of Garmin and is protected under the United States of America copyright laws and international copyright treaties. You further acknowledge that the structure, organization and code of the Software are valuable trade secrets of Garmin and that the Software in source code form remains a valuable trade secret of Garmin. You agree not to decompile, disassemble, modify, reverse assemble, reverse engineer or reduce to human readable form the Software or any part thereof or create any derivative works based on the Software. You agree not to export or re-export the Software to any country in violation of the export control laws of the United States of America.

Introduction

Software License Agreement

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Introduction

the following items. If any parts are missing, please contact your Garmin dealer immediately.

Packing List

GPSMAP 188/188C/238 Sounder

Standard and Optional Transducers

Unit part numbers 010-00268-01, 010-00239-02, 01000239-03, and 010-00250-11 include a 200/50kHz, 10/40 degree, plastic, depth and temp, transom mount transducer. For a complete list of optional transducers, see page 96.

For the most recent list of available accessories for

your GPS unit, current user manuals and software

updates, visit our web site at www.garmin.com.

Before installing and getting started with your unit, please check to see that your package includes

Standard Package:

• GPSMAP 188/188C/238 Sounder Unit

• GA 29 External Antenna and 30’ cable

• Gimbal Mount and Knobs

• Power/Data Cable

• Owner’s Manual

• Quick Reference Card

• Protective Cover

Optional Accessories:

• US A/C PC Adapter

• EURO A/C PC Adapter

• Cigarette Lighter Adapter

• BlueChart Marine Data Cards, MapSource CDs, USB Data Card Programmer and Data Cards

• USB Data Card Programmer

• GBR21 Beacon Receiver for differential corrections; GA 22 H-Field Antenna

• 2nd Mounting Station

• Marine Swivel Mount, 1” RAM

Mount (GPSMAP 188 with external antenna only)

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Designed for detailed electronic charting capability, the Garmin GPSMAP 188/188C/238 Sounder is

a powerful navigation device that can give you the information you need:

Precision Performance

• 188C: High-contrast, 16-color LCD screen with backlighting; 188/238: High-contrast, ten-level gray, LCD screen with backlighting

• 12-channel parallel receiver tracks and uses up to 12 satellites for fast, accurate positioning

• WAAS Capable — receive signals from the additional set of WAAS (Wide Area Augmentation System) satellites to give you better accuracy

• Differential-Ready — just add an optional Garmin beacon receiver for better than 5-meter accuracy

• Fully gasketed, high-impact plastic alloy case, waterproof to IEC 529 IPX7

Advanced Navigating and Plotting

• 3000 alphanumeric waypoints with selectable icons and comments

• Built-in Worldwide marine basemap to 20 miles includes detailed ocean, river and lake coastlines, cities, interstates, US state highways, and local thoroughfares

• 50 reversible routes with up to 254 (188C; 50 on 188/238) waypoints each

• Uploadable maps using Garmin’s MapSource™ PC products and BlueChart™ Data Cards

• Coordinates: Lat/Lon, UTM/UPS, Loran TD, plus over 20 grids, including Maidenhead

• TracBack route feature which allows you to quickly retrace your track log to a starting position

• Built-in simulator mode

• Built-in tide information from over 3,000 tide stations around the USA coastline, Alaska, Hawaii, western Canada and several Caribbean Islands

Superior Fishﬁ nding Ability

• Whiteline feature provides a clear image of both bottom hardness and structure

• See-Thru

technology which helps separate ﬁ sh returns from thermoclines and structure

• Four zoom levels with a moving view window

• Underwater waypoint marking

• Map/Sonar split screen combines navigation and ﬁ shﬁ nding information

• Fish and depth alarms

Introduction

Capabilities

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Introduction

Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . i-viii

Preface and Registration . . . . . . . . . . . . . . . . . . i

FCC Compliance . . . . . . . . . . . . . . . . . . . . . . .ii

Warnings and Cautions . . . . . . . . . . . . . . . . . iii

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv

Software License Agreement . . . . . . . . . . . . . . . v

Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . vi

Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Table of Contents . . . . . . . . . . . . . . . . . . . . . viii

Section One: Getting Started . . . . . . . . . . . . 1-21

Keypad Usage . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Initializing the Receiver . . . . . . . . . . . . . . . . . .2

Selecting Options & Entering Data . . . . . . . . . . 4

Backlighting . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Map Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Going to a Destination . . . . . . . . . . . . . . . . . .11

Sonar Page . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Compass Page . . . . . . . . . . . . . . . . . . . . . . . .16

Numbers Page . . . . . . . . . . . . . . . . . . . . . . . . 16

Highway Page . . . . . . . . . . . . . . . . . . . . . . . . .17

viii

Active Route Page . . . . . . . . . . . . . . . . . . . . . .19

Main Menu Page . . . . . . . . . . . . . . . . . . . . . . .20

Section Two: Reference . . . . . . . . . . . . . . . . 22-77

Map Page . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Using the Cursor . . . . . . . . . . . . . . . . . . .22

Selecting Map Scales . . . . . . . . . . . . . . . . .24

Map Page Options . . . . . . . . . . . . . . . . . .25

Sonar Page . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Using the Adjustment Menu . . . . . . . . . . .33

Sonar Page Options . . . . . . . . . . . . . . . . .36

Compass Page . . . . . . . . . . . . . . . . . . . . . . . .41

Numbers Page . . . . . . . . . . . . . . . . . . . . . . . . 42

Highway Page . . . . . . . . . . . . . . . . . . . . . . . . .42

Waypoints . . . . . . . . . . . . . . . . . . . . . . . . . . .44

Creating . . . . . . . . . . . . . . . . . . . . . . . . . .44

Reviewing and Editing . . . . . . . . . . . . . . .48

Going to a Destination . . . . . . . . . . . . . . . . . .53

Go To . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

TracBack . . . . . . . . . . . . . . . . . . . . . . . . . .54

MOB Key . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Creating . . . . . . . . . . . . . . . . . . . . . . . . . .57

Following . . . . . . . . . . . . . . . . . . . . . . . . .58

Route List Page . . . . . . . . . . . . . . . . . . . . .59

Route Review Page . . . . . . . . . . . . . . . . . .60

Active Route Page . . . . . . . . . . . . . . . . . . . . . .64

Find Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Main Menu Page . . . . . . . . . . . . . . . . . . . . . . .67

GPS Tab . . . . . . . . . . . . . . . . . . . . . . . . . .68

Tide Tab . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Trip Tab . . . . . . . . . . . . . . . . . . . . . . . . . .74

Celestial Tab . . . . . . . . . . . . . . . . . . . . . . .74

Track Tab . . . . . . . . . . . . . . . . . . . . . . . . .75

DSC Tab . . . . . . . . . . . . . . . . . . . . . . . . . .77

Card Tab . . . . . . . . . . . . . . . . . . . . . . . . . .82

Time Tab . . . . . . . . . . . . . . . . . . . . . . . . .82

Pages Tab . . . . . . . . . . . . . . . . . . . . . . . . .83

Temp Tab . . . . . . . . . . . . . . . . . . . . . . . . .84

System Tab . . . . . . . . . . . . . . . . . . . . . . . . 84

Units Tab . . . . . . . . . . . . . . . . . . . . . . . . .85

Communication Tab . . . . . . . . . . . . . . . . . 87

Alarm Tab . . . . . . . . . . . . . . . . . . . . . . . . . 90

Appendices . . . . . . . . . . . . . . . . . . . . . . . . 92-121

Appendix A: Installation . . . . . . . . . . . . . . . . . 92

Appendix B: Data Cards . . . . . . . . . . . . . . . .100

Appendix C: Maintenance . . . . . . . . . . . . . .101

Appendix D: Loran TD . . . . . . . . . . . . . . . . .102

Appendix E: Map Datum . . . . . . . . . . . . . . . 104

Appendix F: Messages . . . . . . . . . . . . . . . . .106

Appendix G: Navigation Terms . . . . . . . . . . .108

Appendix H: Time Offsets . . . . . . . . . . . . . .110

Appendix I: Understanding Sonar . . . . . . . .111

Appendix J: Speciﬁ cations . . . . . . . . . . . . . .116

Appendix K: Index . . . . . . . . . . . . . . . . . . . .118

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Using the Keypad

ZOOM IN Key— adjusts the map scale to display a smaller area with more detail (Zooms in).

ZOOM OUT Key— adjusts the map scale to display a larger area with less detail (Zooms out).

Getting Started

Keypad Usage

NAV Key— displays the Go To and Follow navigation menu.

PAGE Key— selects the main pages in sequence and returns display from a submenu page.

QUIT Key— returns the display to the previous page and, when entering data, it restores the previous

value (cancels data entry).

MENU Key— displays a menu of available options for the current page. Press twice to display the Main Menu.

ARROW KEYPAD— used to select (Highlight) menu options and enter data. It also controls cursor movement on the Map Page.

FIND Key— activates the ﬁ nd function to search for nearby items and user waypoints.

ENTER/MARK Key— selects a highlighted menu option. When entering data, it allows you to initiate

entry, and then to accept the selected value(s). It also marks the current location as a waypoint when pressed and held for more than one second.

MOB (Man OverBoard) Key— activates the Man OverBoard navigation feature when pressed.

POWER/BACKLIGHT/CONTRAST Key— turns the unit on/off and adjusts display illumination.

Also controls Contrast on monochrome units.

)

NOTE: Always press and release a key to perform its primary function. Pressing and holding the ENTER/MARK key will activate its secondary function.

ZOOM

NAV

QUIT

FIND

ZOOM

OUT

PAG E

ENTER

MARK

MOB

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Getting Started

Initializing the Receiver/

Power On

GPSMAP 188/188C/238 Sounder Warning Screen

The GPSMAP 188/188C/238 Sounder’s advanced keypad system is designed to allow for fast, convenient selection of navigation options and data entry. The Getting Started Tour will introduce you to the keypad and provide a ‘hands-on’ lesson in using the GPSMAP 188/188C/238 Sounder. We strongly encourage you to follow the Getting Started tour before using your unit for actual navigation.

The GPSMAP 188/188C/238 Sounder Quick Reference Guide contains helpful tips on using the unit and performing various navigation tasks. It’s a good idea to keep the Quick Reference Guide nearby whenever you’re operating your GPSMAP 188/188C/238 Sounder.

Initializing the Receiver

The ﬁ rst time you power up your GPSMAP 188/188C/238 Sounder, the receiver must be given an opportunity to collect satellite data and establish its present position. To ensure proper initialization, the GPSMAP 188/188C/238 Sounder is shipped from the factory in AutoLocate mode, which allows the receiver to “ﬁ nd itself” anywhere in the world. To speed up the initialization process, we recommend using the graphic initialization process described on the next page, which usually provides a position ﬁ x within a few minutes.

Before you initialize, make sure the GPSMAP 188/188C/238 Sounder unit and antenna have been correctly installed on your vessel according to the instructions in Appendix A. The antenna needs to be in a location with a clear and unobstructed view of the sky to receive satellite signals.

To turn on the GPSMAP 188/188C/238 Sounder:

1. Press and hold the POWER key until the power tone sounds and the display comes on, then release the POWER key. A warning page appears, asking you to read and acknowledge important information regarding the use of the unit.

2. After reading the warning, press ENTER to agree and move to the next display.

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To graphically initialize the GPSMAP 188/188C/238 Sounder:

1. Press the MENU key twice for the Main Menu. Press Up or Down on the ARROW KEYPAD until the ‘GPS’ tab is highlighted, then press the MENU key once.

2. Using the ARROW KEYPAD, highlight ‘Initialize Position’ and press ENTER to initialize the receiver from the map. The Initialize Position Page appears, prompting you to select your approximate location with the map cursor.

3. Use the ARROW KEYPAD to move the map cursor and point to your approximate location within 200 miles. If you have difﬁ culty identifying your position, press and release the IN key to see the next lower map scale.

4. Once you have determined your approximate location on the map, press the ENTER key.

NOTE: This does not “calibrate” the unit in any way, but rather helps to speed up the initial satellite acquisition. If the unit displays “Ready (2D) or (3D )” during this process, it is not necessary to initialize the unit.

The GPSMAP 188/188C/238 Sounder will now begin searching for the appropriate satellites for your region and should acquire a ﬁ x within a few minutes. When viewing the ‘GPS’ tab on the Main Menu, a signal strength bar for each satellite in view appears on the bottom of the page, with the appropriate satellite number under each bar. The progress of satellite acquisition is shown in three stages:

• No signal strength bars— the receiver is looking for the satellites indicated.

• Hollow signal strength bars— the receiver has found the indicated satellites and is collecting data.

• Solid signal strength bars— the receiver has collected the necessary data and the satellites are ready for use.

Once the receiver has collected information from at least three satellites, the top of the screen

displays either “Ready (2D or 3D)”, and the GPSMAP 188/188C/238 Sounder is ready for use.

Getting Started

Initializing the Receiver

Point to your approximate location and press ENTER/MARK.

A satellite’s strength bars turn green when it’s ready for use.

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Getting Started

Selecting Options

Options Menu with highlighted option.

Use the ARROW KEYPAD to highlight the next option. Press ENTER/MARK to activate.

Selecting Options and Entering Data

Before moving ahead into the features of the GPSMAP 188/188C/238 Sounder, you will need to learn basic operations. You can select and activate options and enter data to customize the GPSMAP 188/188C/238 Sounder to ﬁ t your requirements. You can use the ENTER/MARK key and ARROW KEYPAD to select options, enter names and numbers in data ﬁ elds, and activate your selections.

To select and activate an optional feature:

1. With any page displayed, press the MENU key to pop-up the options menu. The options menu displasy a list of optional features which are speciﬁ c for that particular page. To select any feature on the list of options requires movement of the cursor, which is identiﬁ ed as highlighting, selecting or choosing an item in a list or a ﬁ eld (box) on a page.

2. Use the ARROW KEYPAD to move the cursor (highlight) up and down a list or up, down, and sideways on menus.

3. Once you have moved to the selection desired, press the ENTER key to either activate the feature or the MENU key to pop-up a sub-menu or list of yet more feature options. Just repeat this process to select an option from the list or press the QUIT key to return to the previous setting.

The QUIT key will move backwards through these steps or when pressed, back to the main page

you started on.

To select and activate a function button:

1. When moving about a page with function buttons, like the ‘New Map Waypoint’ page, you will observe functions such as ‘Delete’, ‘Show Map’ and ’OK’. To activate the function, highlight the desired button and press the ENTER key.

Pop-up list of options for a highlighted ﬁ eld.

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Naming a waypoint or placing any sort of data that has not been predeﬁ ned requires the use of

both the ARROW KEYPAD and the ENTER/MARK key.

To enter a name or number in a data ﬁ eld:

1. Once you have accessed a page with programmable data ﬁ elds (i.e. ‘ Waypoint Edit’) you can use the ARROW KEYPAD to move the cursor (Highlight) to ﬁ elds on the page. Use the UP/DOWN arrows to move up or down and the LEFT/RIGHT arrows to move sideways.

2. Pressing the ENTER key with the ﬁ eld highlighted begins the process for entering data in the form of alphanumeric characters.

3. Use the ARROW KEYPAD UP/DOWN arrows to cycle through numbers 0 to 9, plus/minus symbols, blank space, and the alphabet. Pressing and releasing the keypad moves you character by character through the list. Pressing and holding the keypad moves you rapidly through the list.

4. Use the ARROW KEYPAD LEFT/RIGHT arrows to move to the next character on the line or backwards to edit characters. If there are more than two lines of data, keep pressing to the RIGHT to drop down to the next line.

5. When data entry is completed press ENTER to accept data, then move to the next programmable ﬁ eld. Not all data ﬁ elds are programmable, like the date and time. When moving about a page with these type of ﬁ elds, the cursor will skip over them.

Every ﬁ eld and button on this page can be programmed or activated.

A waypoint symbol can be selected from a list of symbols.

The waypoint can be renamed.

A depth can be entered.

Getting Started

Entering Data

Pressing UP or DOWN on the ARROW KEYPAD changes numbers and letters.

Pressing LEFT or RIGHT on the ARROW KEYPAD moves the cursor along the line or to the next line.

Data Entry Field

Non-programable data ﬁ elds

A comment can be added.

The coordinates can be changed.

Option buttons can be activated.

Page 16

Getting Started

Tour/Backlighting

A full-screen GPS Information pop-up page is displayed after you press the ENTER key to acknowledge the Warning Page. The pop-up page will go away after the unit gets a position ﬁ x or you press either ENTER or QUIT. The page can be disabled and enabled on the Pages Tab (see page 83).

GPSMAP 188/188C/238 Sounder Getting Started Tour

The Garmin GPSMAP 188/188C/238 Sounder is a powerful electronic navigation system that provides detailed map coverage and convenient control of many advanced features right from the screen display. This tour is designed to take you through the basic pages and functions of the system using the simulator mode. Once you’re familiar with the main pages and functions of the unit, refer to the reference section for instructions on performing speciﬁ c tasks and functions.

The Getting Started Tour assumes that the receiver has been properly installed and initialized, and you have not changed any of the default unit settings. If you have changed any settings (position formats, units of measure, etc.), the descriptions and pictures in the tour may not match your conﬁ guration.

After powering on the GPSMAP 188/188C/238 Sounder, the GPS Information Page appears as the receiver begins acquiring satellites. From this or any other page, you may also adjust the backlighting.

The GPSMAP 188/188C/238 Sounder’s adjustable screen backlighting is controlled with the POWER key, and may be adjusted at any time from any page. The backlight can cycle through off, user-deﬁ ned, and maximum backlight levels by repeatedly pressing the POWER key.

To turn on and adjust the backlighting:

1. Press POWER and the Light window appears.

2. Press POWER again and the user-deﬁ ned level of backlighting activates. You may adjust this level by pressing UP or DOWN on the ARROW KEYPAD. If you press POWER one more time, the back- lighting will be at the maximum setting.

3. Press ENTER or QUIT when done.

The backlight will now cycle through off, the user-deﬁ ned, and maximum backlight levels by

repeatedly pressing the POWER key.

Page 17

You may also adjust the screen contrast (GPSMAP 188/238 monochrome only).

To adjust the screen contrast:

1. Press POWER and the Light and Contrast window appears.

2. To decrease or increase the screen contrast, press left or right on the ARROW KEYPAD.

3. Press the ENTER/MARK key to ﬁ nish.

Each page of the GPSMAP 188/188C/238 Sounder’s system also features an options page, which gives you access to other functions and features that relate to the speciﬁ c page you are viewing. To get a feel for how the option pages work, let’s put the GPSMAP 188/188C/238 Sounder into simulator mode.

To activate the simulator mode:

1. Press the MENU key twice for the Main Menu. Press Up or Down on the ARROW KEYPAD until the ‘GPS’ tab is highlighted, then press the MENU key once.

2. Use the UP or DOWN arrow of the ARROW KEYPAD to highlight the ‘Start Simulator’ option and press ENTER. Choose ‘No’ to the retail demonstration and press the ENTER key.

3. Press the ENTER key to conﬁ rm the ‘Running Simulator’ message that appears at the bottom of the display. ‘Simulating’ appears at the top of the Main pages.

Use the ARROW KEYPAD to move the backlighting slider UP for brighter or DOWN for dimmer backlighting. Monochrome units will have an additional Contrast adjustment.

While in Simulator mode, a ‘Running Simulator’ message appears after 2 minutes of inactivity..

Now you’re ready to continue the rest of the simulated tour. Keep in mind that the GPSMAP 188/

188C/238 Sounder does not track satellites in simulator mode, and this mode should never be used for actual navigation. All the waypoint and route planning done in simulator mode is still

retained in memory for future use.

Getting Started

Simulator Mode

A “Running Simulator” message appears after 2 minutes of inactivity.

Page 18

Getting Started

Main Pages/

Map Page

Main Pages

The Map Page is one of six main pages used in the GPSMAP 188/188C/238 Sounder’s system. The six main pages are the Map Page, Sonar Page, Compass Page, Numbers Page, Highway Page, and Active Route Page. All six pages are linked together in a simple chain, which allows you to scroll through the pages in either direction using the PAGE and QUIT keys.

Map Page

Sonar Page

PAG E

Compass Page

Numbers Page

Highway Page

QUIT

Active Route Page

The GPSMAP 188/188C/238 Sounder’s Map Page combines digital chartplotting with a user-selectable display of navigation data and a built-in worldwide database. It will also be the page you use most to create and edit waypoints and routes. Before we take off on our practice route, let’s take a brief look at its various features and displays.

The map display shows your “boat” as a triangle marker on an electronically generated chart. Geographic names, roads, markers and buoys that are provided by the optional BlueChart or MapSource data are also shown. It also displays your track, routes and nearby waypoints. An on-screen cursor lets you pan to other map areas, determine the range and bearing to a position, and perform various waypoint and route functions.

The data window, located at the top of the page, provides a user-selectable display of various navigation data, including speed over ground, distance to the next navigation point, compass ribbon, and

current position coordinates. The current map scale setting is located at the bottom right of the page.

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Using the Map Cursor

Working from the Map Page is a simple process that centers around the use of the cursor. Controlled by the ARROW KEYPAD, the cursor is an important tool that can be used to pan to other map locations, mark and edit waypoints and routes, and review position data of on-screen map items and waypoints.

To get a feel for using the Map Page and using the cursor, try the following exercise:

1. Use the IN/OUT keys to set the map scale to the 50 nm setting. Your boat should be near the center of the map, at the receiver’s last known position. (If your boat isn’t where it should be, make sure that you have initialized the receiver and acquired a position as described on pages 4-5.)

2. Use the ARROW KEYPAD to move the cursor. Notice how another data ﬁ eld appears, showing the bearing and distance from your boat to the cursor, along with the latitude/longitude of the cursor.

3. Press the QUIT key to remove the cursor and re-center your boat on the map display.

As you become more familiar with the cursor, you’ll see that the map display actively scrolls or ‘pans’, letting you explore areas around the world and create waypoints and routes. Wherever you move the cursor, you’ll always be just one QUIT keystroke away from returning the map to your present position.

Now that you’ve seen how the Map Page can be used to monitor your present location, let’s take a minute to learn how to mark and store your present position as a waypoint. Since you’re in simulator mode, the present position displayed will be the last position calculated by the receiver, which should be the spot where you’ve initialized the unit. This will also give you an opportunity to see how the GPSMAP 188/188C/238 Sounder’s keypad and ENTER/MARK key are used for data entry and changing the waypoint name and symbol.

Getting Started

Map Cursor

Current position

Map Scale

Distance

Bearing

Cursor Coordinates

Map Cursor

Page 20

Getting Started

Marking Waypoints

You can choose from a list of useful symbols. There are two Diver Down waypoint symbols to select from: the International and U.S. versions.

Press ENTER/MARK after entering the name.

To mark your present position:

1. Hold down the ENTER/MARK key until the ‘New Waypoint’ window appears then release the key. The window will show a default three-digit waypoint name/number (001), symbol (dot), and position. You can leave the name as the auto-assigned number, but for this exercise, lets change the name to ‘DOCK’.

2. Use the ARROW KEYPAD to highlight the waypoint name ﬁ eld (001) and press ENTER/MARK. You will see that just the ﬁ rst ‘0’ is now highlighted.

3. Press LEFT on the ARROW KEYPAD to clear the name ﬁ eld.

4. Press UP or DOWN on of the ARROW KEYPAD until the letter ‘D’ appears, and then press RIGHT to go to the next space to the right, then UP or DOWN again until ‘O’ appears. Repeat this until you have entered the name ‘DOCK’. If you make a mistake and select an incorrect character, simply press LEFT on the ARROW KEYPAD to backspace the cursor and then UP or DOWN to correct the entry. (If you accidentally press ENTER/MARK before you are done, simply press ENTER/MARK again and move the highlight to where you left off.)

5. After you have entered all the letters, press ENTER/MARK to conﬁ rm the name.

6. To access the waypoint symbol page, highlight the waypoint symbol ﬁ eld, which is to the left of the waypoint’s name and press ENTER/MARK. The default symbol is a dot.

7. You will see an alphabetical list of available waypoint symbols to choose from. Press the ARROW KEYPAD UP or DOWN until you highlight the ‘ANCHOR’ symbol. You will see a scroll bar on the right of the window indicating your current position on the entire list of symbols.

8. Press ENTER/MARK to conﬁ rm the ‘ANCHOR’ symbol.

9. Highlight ‘OK’ at the bottom of the window and press ENTER/MARK again to conﬁ rm the ‘OK’ prompt and save the waypoint.

The waypoint is now stored in memory. Note that waypoints may also be created graphically from the map display or by manually entering position coordinates. Each of these techniques is described in the reference section of the manual and/or on your GPSMAP 188/188C/238 Sounder Quick Reference Guide.

Page 21

Going to a Destination

GPS is all about marking positions as waypoints and navigating to them using the receiver’s steering guidance and map displays. We’ve already seen how to use the ENTER/MARK key to store your present position, so it’s time to move on to the fun part—going to a destination.

The NAV key, located on the keypad above the QUIT key, is the primary tool used to select a destination waypoint, TracBack, or a route to navigate. The NAV key can be used in two primary ways:

• Pressing NAV once displays a list of options from which you can select ‘Go To Point’, ‘Follow Route’, ‘Follow Track’, or ‘Stop Navigation’.

• Highlighting an on-screen waypoint or map item as a destination directly from the Map Page and pressing NAV allows you to graphically select points to “Go To”.

For our simulated trip, you’re going to select a pre-programmed tour route using the ﬁ rst method. This will also show how the MENU key is used throughout the GPSMAP 188/188C/238 Sounder system to provide tab style options and functions. Let’s start by changing the position to where the practice route is located.

To change the GPSMAP 188/188C/238 Sounder position in simulator mode:

1. Press the MENU key twice to display the list of Main Menu tab items.

2. Use the ARROW KEYPAD to highlight the ‘Systm’ tab.

3. Highlight ‘Set Position’ in the simulator setup window and press ENTER.

4. From the Initialize Position page, press the MENU key. With ‘Enter As Text’ highlighted, press ENTER.

5. On the Enter Position window, press ENTER then use the ARROW KEYPAD to enter N34°56.800’, W076°24.066’ and press ENTER when done, then press QUIT to return to the Map Page.

Getting Started

Using the NAV Key

Text entry for simulator position.

For future practice, you may skip steps 3 through 5 and use the ARROW KEYPAD to point to a location from the Initialize Position page.

Page 22

Getting Started

Simulated Tour

The Set Position, Track Control, Track and Speed ﬁ elds will only show while in simulator mode.

Select the practice route and press ENTER/MARK.

To activate the practice route stored in memory for navigation:

1. Press NAV. A list of options appear.

2. Use the ARROW KEYPAD to highlight ‘Follow Route’ and press ENTER.

3. The Select Route page appears, with the ‘GPSMAP TOUR’ route highlighted.

4. Press ENTER, highlight ‘Activate’, and press ENTER again to activate the route.

To zoom in to a closer map scale:

1. Repeatedly press the ZOOM IN key until you select the 3 nm scale.

You may also hold the ZOOM IN or ZOOM OUT keys down to quickly scroll through the map scales. The Map Page should now display ﬁ ve waypoints chained together in a simple route, with your boat at the ﬁ rst route waypoint.

A data ﬁ eld at the top of the page now displays the speed, distance to the second route waypoint, your position coordinates and a compass ribbon which shows you which way to go. To get started, let’s enter a speed for our vessel, which we can do from the Main Menu Page.

To enter a boat speed:

1. Press the MENU key twice to display the Main Menu Page.

2. Use the ARROW KEYPAD to highlight the ‘Systm’ tab, then press RIGHT then DOWN until the ﬁ eld below the word ‘Speed’ is highlighted and press ENTER.

3. Use the ARROW KEYPAD to enter a speed of 40 knots.

4. Press ENTER to ﬁ nish, and QUIT until you return to the Map Page.

Once a speed has been entered, you’ll notice that the map automatically begins to move slowly, keeping your boat centered on the display. The direction of movement, also called ‘track’, is controlled by the simulator.

Page 23

You’ll now have a clearer picture of the route you are navigating. Keep in mind that when you exceed the usable range of the built-in database or the optional MapSource or BlueChart data in use, the range ﬁ eld displays ‘overzoom’ to indicate that you should exercise extreme caution using the map data. Press the ZOOM IN key to zoom into the 2 nm scale. Now that you’ve zoomed in a little closer to your route, you can pan ahead of your vessel with the cursor to review map items and create on-screen waypoints. Move the cursor to highlight the ‘TOUR3’ waypoint— just use the ARROW KEYPAD to move the cursor as close as possible to the waypoint (To move the cursor in small increments, try a series of short key presses).

Once the cursor is over the TOUR3 waypoint, you’ll notice that the waypoint symbol and name are highlighted. The data ﬁ eld at the top of the page displays the waypoint name, the range and bearing from your present position, and the coordinates for the waypoint.

To review the waypoint page for a selected waypoint:

1. With the waypoint highlighted, press ENTER.

2. To return to the Map Page, press ENTER again or press QUIT.

The waypoint will ‘highlight’ when the cursor is moved over it.

The cursor can also be used to create new waypoints right from the map display.

To create a new waypoint using the cursor:

1. Use the ARROW KEYPAD to move the cursor as close as possible to the following position: N35º 02.914; W 076º 26.152’ (Use the data window to verify the cursor position.)

2. Press and release the ENTER/MARK key to capture the cursor position. Do not hold the button down, as doing so will mark your present position, not the map position.

3. Use the ARROW KEYPAD to highlight the waypoint symbol ﬁ eld to the left of the waypoint name/ number.

4. Press ENTER to access the symbol page.

5. Use the ARROW KEYPAD to select the ‘Shipwreck’ symbol and press ENTER to conﬁ rm.

6. Highlight ‘OK’ and ENTER again to ﬁ nish.

Getting Started

Reviewing/Creating

Map Waypoints

Creating a new waypoint with the map cursor.

Page 24

Data Fields

Simulated Fish Arch

Bottom

Whiteline

Thermocline

Outer edge beam returns

Frequency mode

Getting Started

Sonar Page

Dual frequency returns

Adjustment Menu

Depth Scale

Center beam return

Flasher

Sonar Page

The Sonar Page is where your GPSMAP 188/188C/238 Sounder becomes a powerful ﬁ shﬁ nder/ ﬂ asher. The top left of the screen contains data ﬁ elds, while the Adjustment Bar above the data ﬁ elds allows direct access to the settings most commonly changed while using the Sonar Page. The middle of the page contains a right-to-left moving sonar image of the water beneath your boat (Items appear as they pass under your transducer. Those items on the right side of the screen are closer to you than those on the left.). Along the right side of the screen is an adjustable scale which reﬂ ects the depth of the area being displayed. If the unit does not detect a transducer attached to the unit, a “Sonar Turned Off” message appears across the Sonar Page. You may also show a sonar ﬂ asher and color bar on the right side.

The sonar display may also be set to show a split screen view of a zoomed portion of the sonar, bottom lock (display scaled from the bottom up), or a combination of these options (see pg. 34). For example, you may choose to show dual frequency at a 2X zoom (Dual 2X) on one half and normal range dual frequency (Dual) returns on the other half. The current display mode will be displayed at the bottom of each sonar display.

On color models, sonar returns show as red (strongest), then oranges (strong), yellows (medium), greens (weaker) and blues (weakest). On grayscale models, stronger returns appear darker and weaker returns lighter. The ‘ Fish Symbols’ option (see page 38) allows you to view the actual sonar data, a ﬁ sh symbol, or a combination of both. ‘Fish Symbols’ appear as green. When the unit is set to ‘Dual’ (see page 35), the appearance of the ﬁ sh symbols (and simulated ﬁ sh returns) will change. Fish symbols from the narrower beam (200kHz) will be solid (or narrow returns), but the returns from the wider beam (50kHz) will be hollow (or wide returns). Simulated ﬁ sh icons are displayed in three different sizes. Actual ﬁ sh returns may not always appear as perfect arches, due to the speed, ﬁ sh orientation, and/or other conditions.

More on understanding the Sonar Page may be found on pages 111 and in Appendix I.

Page 25

Using the Adjustment Menu

The Adjustment Menu allows direct access to the settings and features most commonly used on the Sonar Page. There are 10 main adjustment options available: Range, Zoom, View/Span, Gain, Target Level, Whiteline, Frequency, Depth Line, Noise Reject, and Scroll. The currently selected option appears in the upper left of the display with up and down arrows on either side of the option name.

To select an adjustment option from the Sonar Page:

1. Press the ARROW KEYPAD LEFT/RIGHT to scroll through the options in the upper left of the display, then press ENTER to access the desired option’s adjustment window.

OR:

1. Press MENU, highlight ‘Adjustments’ and press ENTER. A list of all options and their current settings appears, with the selected option highlighted. Press UP/DOWN on the ARROW KEYPAD to select the desired option and press ENTER to access the adjustment window.

To easily exit any of the adjustment options, press the QUIT key.

To change an Adjustment Menu setting:

1. Select an adjustment option to change using one of the two methods described above. The adjustment window will automatically timeout and disappear when idle for 20 seconds.

2. Press the ARROW KEYPAD UP/DOWN to place the pointer or setting bar at the desired setting, range or percentage (Off, 1-100%).

3. Press ENTER or QUIT to exit the adjustment window; or press LEFT/RIGHT on the ARROW

KEYPAD to view another adjustment window.

To change a setting back to ‘Normal’ or ‘Auto’:

1. On the adjustment window for the desired option, press MENU.

2. Select the desired setting and press ENTER.

For detailed information on the functions and options of the Sonar Page, see pages 33-39. To learn

more about how sonar works, see Appendix I.

Getting Started

Sonar Page

Press MENU, highlight ‘Adjustments’ and press ENTER to see a list of all options and their current settings.

Zoom adjustment options

Page 26

Current Destination

Data Fields

Getting Started

Compass Page/

Numbers Page

Compass Page

Compass

Ring

Pointer

Arrow

Now that we’re navigating to an actual destination, let’s move on to the GPSMAP 188/188C/238

Sounder’s navigation pages by pressing the PAGE key.

Compass Page

The Compass Page provides graphic steering guidance to a destination waypoint, with an emphasis on the bearing to your destination and current direction of travel. The middle of the page features a rotating ‘compass ring’ that shows your course over ground (track) while you’re moving, and a bearing pointer that indicates the direction of the destination (bearing) relative to the course over ground. The compass ring and pointer arrow work independently to show—at a glance—the direction of your movement and the direction to your destination. For instance, if the arrow points up, you are going directly to the waypoint. If the arrow points any direction other than up, turn toward the arrow until it points up—then continue in that direction.

The current speed, distance to the next waypoint, turn angle, and current position are displayed at the top of the screen. This page provides better steering guidance when travelling at slower speeds and/ or when making frequent directional changes. When you are not navigating to a waypoint, the compass will show your direction of travel as you move but the arrow will not appear.

Numbers Page

Press PAGE to see the next page appearing in the main sequence, the Numbers Page. The Numbers Page allows for precision navigation to 1 degree of steerage. The default page displays 3 large numbers ﬁ elds. You may customize the Numbers Page to display the size and number of ﬁ elds along with the type data you wish to see. (See pages 26-28 for changing the types of data.)

Numbers Page

Page 27

To split the data ﬁ elds:

1. Press MENU, then press ENTER. Highlight the ‘SPEED’ data ﬁ eld and press MENU.

2. Highlight ‘Split Numbers’, then press ENTER. You will now see four new data ﬁ elds. Press QUIT when done.

3. To return to the original conﬁ guration, repeat the above steps, but instead of ‘Split Number’, select either ‘Merge Numbers’ or ‘Defaults’. Press QUIT when done.

Let’s move on to the Highway Page by pressing the PAGE key.

Highway Page

The GPSMAP 188/188C/238 Sounder’s Highway Page also provides graphic steering guidance to a destination waypoint, placing greater emphasis on the straight-line desired course and the distance and direction you are off course. As you head toward your destination, the middle of the screen provides visual guidance to your waypoint on a moving graphic “highway.” Your present position is at the bottom center of the highway display. The line down the middle of the highway represents your desired course.

As you navigate toward a waypoint, the highway will actually move, indicating the direction you’re off course. To stay on course, simply steer toward the center of the highway or “keep it on the road”. The four default data ﬁ elds at the top of the page indicate ‘Speed’ and ‘Distance To Next’ point, along with ‘To Course’ which shows the bearing to get you back on course and ‘Time To Next’ point. Additionally, a compass ribbon is displayed to show your current heading along with a dark, vertical bar which will indicate the direct bearing to the navigation point. When the red, vertical indicator lines up with the black bar in the middle, you are heading directly to the navigation point. Use the Highway Page as your primary navigation page (in lieu of the Compass Page) when your main concern is following a deﬁ ned course.

Current Destination

Data Fields

Desired Course

Getting Started

Numbers Page/

Highway Page

Numbers Page with split numbers

Present

Position

Zoom

Scale

Highway Page

Page 28

Getting Started

Highway Page

Whenever the GPSMAP 188/188C/238 Sounder is in simulator mode, you can also adjust your speed and course from the Highway Page using the ARROW KEYPAD. As you head toward each waypoint in the tour route, try adjusting your boat speed and course to get a feel for how the highway works.

To adjust the simulated boat speed/heading from the Highway Page:

1. Press the UP arrow of the ARROW KEYPAD to increase the speed in 10 knot/kph/mph increments. Press the DOWN arrow to decrease the speed in the same increments. Press the LEFT and RIGHT arrows of the ARROW KEYPAD to steer the boat (adjust the heading).

Steer towards the center of the highway or towards the black vertical bar on the compass ribbon to get back on course.

)

on course. You can zoom in or out on the Highway display for a smaller or larger view. Five available settings range from 1X to 16X, with a default setting of 8X. The current scale appears in the bottom right of the display.

NOTE: In simulator mode, you may also change the simulated speed by pressing UP or DOWN on the ARROW KEYPAD from the Compass page.

Notice that as you get off course, the highway will move to give you graphic guidance to get back

To zoom in or out on the highway display:

1. Press either the IN or OUT key to increase or decrease the zoom scale.

Page 29

Changing Data Fields

The data ﬁ elds on the main pages may also be conﬁ gured to display several different information categories (see pages 26-27 for the complete list). On the Highway Page, let’s change the ‘TIME TO NEXT’ ﬁ eld to ‘TIME OF DAY’.

To change a data ﬁ eld:

1. Press the MENU key to display the Highway Page options.

2. With ‘Change Numbers’ highlighted, press ENTER.

3. Use the ARROW KEYPAD to highlight ‘TIME TO NEXT’, then press ENTER.

4. On the alphabetical list of options, use the ARROW KEYPAD to highlight ‘TIME OF DAY’ and press ENTER. (You will see a scroll bar on the right side of the window indicating your current position on the entire list of options.)

5. Press QUIT when ﬁ nished.

Active Route Page

Press PAGE to see the last page appearing in the main sequence, which is the Active Route Page. Whenever you have activated a route or Follow Track, this page lists the names of the route points along with useful data for each point. As you navigate the route, the information will automatically update to indicate the next point along the route. For more detailed information on the Active Route Page, see page 64.

Getting Started

Changing Data Fields/

Active Route Page

You may choose from several different types of data

Current waypoint

Active Route Page

Page 30

Main Menu Tabs

Getting Started

Main Menu Page/

Deleting Waypoints

Main Menu

Submenu

Tabs

Main Menu Page

As you’ve seen, the primary pages provide map and navigation information. The tour’s last page is the Main Menu page, which allows access to the GPSMAP 188/188C/238 Sounder’s waypoint, route, and planning functions, as well as various operational and navigation setup features, and celestial and tide data.

The Main Menu is available from any page, and is accessed through the MENU key.

To access the main menu page:

1. Press the MENU key twice.

The Main Menu page lists 19 vertical ‘tabs’ that are divided into categories by function. You can view a particular menu by simply highlighting the desired tab, which will then show any secondary (horizontal) submenu tabs and options for that tab.

To get a basic feel for how the Main Menu page works, let’s delete the two waypoints you created during the simulated tour. This will ensure that you have a clean slate once you start navigating in your home waters.

To delete the practice waypoints:

1. Use the ARROW KEYPAD to highlight the ‘Points’ menu tab. You will see a list of stored waypoints appear to the right of the Main Menu list.

2. Press RIGHT one time on the ARROW KEYPAD to highlight the ‘User’ tab.

3. Press DOWN on the ARROW KEYPAD and highlight waypoint ‘001’ with the shipwreck symbol.

4. You may delete the waypoint by either pressing MENU, then highlighting ‘Delete Waypoint’; or by pressing ENTER and then highlighting ‘Delete’ from the Waypoint Edit page.

5. Press ENTER to delete the waypoint, then ENTER again to conﬁ rm. Repeat the above steps to delete the ‘Dock’ waypoint also.

Page 31

Congratulations! You’ve now gone through the basic operation of the Garmin GPSMAP 188/188C/ 238 Sounder. Your new digital chartplotter is a powerful tool with many advanced features not covered in the Getting Started tour. For detailed instructions on using these features or performing a speciﬁ c task, please refer to the Quick Reference Guide or the appropriate reference section of this manual. The unit is still in Simulator mode for practice, but automatically returns to it’s ‘Normal’ operation mode when you shut it off and turn it back on.

To turn the GPSMAP 188/188C/238 Sounder off:

1. Press and hold the POWER key for about 2 seconds, until the screen is blank.

2. When the screen is blank, release the POWER key.

The next section of the manual describes the pages and functions of the GPSMAP 188/188C/238 Sounder in detail. If you are unable to locate a speciﬁ c option or function, please refer to the Index on pages 118-120. Thank you for choosing the Garmin GPSMAP 188/188C/238 Sounder navigation unit. We hope it will be a useful and fun tool for you wherever you go!

Getting Started

Powering Off Unit

Page 32

Reference

Map Page

Data Fields

Land

Geographic Name

Navaids

Map Page (shown in cursor mode and using

optional MapSource data).

Cursor

Water

Map Scale

Map Page

The GPSMAP 188/188C/238 Sounder’s Map Page provides a comprehensive display of electronic cartography, plotting and navigational data. When using the unit with the optional BlueChart data or MapSource software, the map display shows your boat on a digital chart, complete with geographic names, map items, navaids, and a host of other chart features. It also plots your track and displays any routes and waypoints you create. An on-screen cursor lets you pan and scroll to other map areas, determine the distance and bearing to a position, and perform various route and waypoint functions.

The ZOOM IN and ZOOM OUT keys, combined with the ARROW KEYPAD, let you select zoom ranges and move the cursor. The map scale displays at the bottom right of the page.

Two basic map operating modes, position mode and cursor mode, determine what cartography is shown on the map display. Position mode pans the cartography to keep the present position marker (triangle) within the display area, while cursor mode pans the cartography to keep the cursor (arrow pointer) within the display area. The GPSMAP system will always power up in position mode, with your vessel centered on the map display. When the ARROW KEYPAD is pressed, the GPSMAP 188/ 188C/238 Sounder will enter cursor mode.

When the cursor is active, an additional data window appears below the data ﬁ elds to indicate the position, range and bearing to the cursor or a selected waypoint or map item.

Using the Cursor

The cursor allows you to pan away from your present position and scroll to other map areas around the world. As you pan past the edge of the current map display, the screen actively scrolls forward to provide continuous map coverage Keep in mind that the boat icon (triangle marker) moves with the scrolling map, and may not be visible on the display screen.

)

NOTE: When the cursor reaches the edge of the map, the unit map pause as it load new data.

Page 33

To activate and move the cursor:

1. Press the ARROW KEYPAD in an UP, DOWN, LEFT or RIGHT direction.

As you move the cursor, the distance and bearing from your present position to the cursor aredisplayed in the data window, along with the cursor’s position coordinates. When you zoom in cursor mode, the cursor is centered on the screen. When the cursor is stationary, a ﬁ xed coordinate position appears in the position ﬁ eld, and the distance and bearing from your present position changes as your boat moves.

To eliminate the cursor and re-center your position on the screen:

1. Press the QUIT key. The GPSMAP 188/188C/238 returns to position mode.

The cursor may also be used to “snap-to” on-screen waypoints and map items, allowing you to review details about a selected position directly from the map display.

To select an on-screen waypoint or map item with the cursor:

1. Use the ARROW KEYPAD to move the cursor to the desired waypoint or map item. If there are several items grouped closely together, zoom IN closer for a better view.

2. When a waypoint or map item is selected, it is highlighted on the screen, with the name and position displayed.

To view additional details about an on-screen waypoint or map item:

1. With the desired item highlighted , press ENTER.

2. If the symbol is a waypoint, the Waypoint Review page appears, allowing you to review and edit the properties of the selected waypoint (see pages 48-49 for more information on the Waypoint Review page).

If the item is a map feature, an Information page appears, showing details about the map item.

With many map items, additional information tabs appears. Use the ARROW KEYPAD to highlight the individual tabs to display additional details and options.

Reference

Map Page Cursor

Move the cursor over an item on the map to highlight it.

Additional information tabs.

Pressing ENTER while highlighting a map item will bring up additional details and options.

Option buttons

Page 34

Reference

Map Page: Cursor

and Zooming

Creating a New Map Waypoint

Using Built-In Basemap

The cursor may also be used to create new waypoints directly from the map.

To create a waypoint with the cursor on an open map location:

1. Use the ARROW KEYPAD to move the cursor to the desired map position.

2. Press and quickly release the ENTER key to capture the cursor location (pressing and holding the ENTER key captures the current location, not the cursor location).

3. The ‘New Map Waypoint’ window appears. With ‘OK’ highlighted, press ENTER to save the new waypoint using the default 3-digit name and symbol.

To create a waypoint with the cursor on a map item:

1. Use the ARROW KEYPAD to move the cursor and highlight the desired map feature.

2. Press ENTER to capture the cursor location. The Information page for that feature appears. Use the ARROW KEYPAD to highlight ‘Create Wpt’ and press ENTER.

3. The New Waypoint window appears. With ‘OK’ highlighted, press ENTER to conﬁ rm the new waypoint using the default name and symbol based on the map feature.

Selecting Map Scales

The map display has 28 available range scales from 20 ft. to 800 mi. (5 m to 1200 km). The map scale is controlled by the IN and OUT keys, with the current scale displayed at the bottom right of the data window.

To select a map scale:

1. Press the OUT key to zoom out and the IN key to zoom in.

Using BlueChart/MapSource Data

Overzoom, no additional data

)

NOTE: The scale value represents the distance from one end of the scale bar to the other.

Page 35

The GPSMAP 188/188C/238 Sounder’s system has a built-in worldwide database to 20 mi, with more detailed coverage available through the use of the optional BlueChart or MapSource data. The GPSMAP 188/188C/238 Sounder displays cartography as long as there is chart information available for the range you’ve selected. Map coverage will conform to the following conditions:

• When the selected zoom range is covered by either the internal database, BlueChart, or MapSource data, cartography will be displayed.

• When the selected zoom range is covered by both the internal database and BlueChart/MapSource data, cartography will be displayed using the data with the best resolution.

• When the selected zoom range exceeds the resolution of the data in use, overzoom cartography will be displayed and an ‘overzoom’ warning appears below the scale ﬁ eld.

Map Page Options

Many features of the GPSMAP 188/188C/238 Sounder are menu driven. Each of the main pages has an options menu, allowing you to custom tailor the corresponding page to your preferences and/or select special features that speciﬁ cally relate to that page. The data window, located at the top of the main pages provides a user-selectable layout of various types of useful data or sonar information. Each data ﬁ eld may be conﬁ gured to display any one of several data options. The data window layout may also be changed to display additional data ﬁ elds and change the actual size of the data displayed. The GPSMAP 188/188C/238 Sounder’s Map Page provides access to functions and features relating to the Map Page and the layout options.

To select an option on the Map Page:

1. Press MENU.

2. Use the ARROW KEYPAD to highlight the desired option and press ENTER.

The available options on the Map Page are: Full Screen Map/Show Data, Change Numbers, Measure Distance, Show Sonar/Show Numbers, Size Split, Set Up Map, and Turn Declutter On/Turn Declutter Off. Following are details on using each of these options.

Reference

Map Page Options

Map Page Options (with Numbers shown)

Page 36

Reference

Map Page Options

Full Screen Map (with BlueChart data)

• Full Screen Map/Show Data — toggles between a full screen map or a map with sonar information and/or data ﬁ elds on the top half of the display. This allows for quick viewing of a full screen map.

• Change Numbers — allows you to specify the type of data displayed in each data ﬁ eld used on the map display. This option is available from any of the main pages.

To change a data ﬁ eld:

1. From the menu, use the ARROW KEYPAD to highlight the ‘Change Numbers’ option and press ENTER.

2. Move the ﬁ eld highlight to the data ﬁ eld you want to change and press ENTER.

3. Move up or down on the list using the ARROW KEYPAD to highlight the data you want to display, and press ENTER. To exit, press QUIT.

The following options are available for display in data ﬁ elds on the main pages:

• BEARING – Compass direction from your position to destination

• COMPASS – Compass ribbon

• COURSE – Desired Track

• DEPTH – Depth below transducer

• DISTANCE TO DESTINATION – Distance to ﬁ nal waypoint

• DISTANCE TO NEXT – Distance to next waypoint

• ELEVATION – Altitude above/below MSL (Mean Sea Level)

• ETA AT DESTINATION – Estimated Time of Arrival to ﬁ nal waypoint

• ETA AT NEXT – Estimated Time of Arrival to next waypoint

• GPS ACCURACY – Shows estimated GPS accuracy

• HIGHWAY – Smaller version of the Highway Page

• MAXIMUM SPEED – Fastest speed the unit has traveled

• MOVE AVERAGE SPEED – Average moving speed

• MOVE TRIP TIME – Time unit has been moving for a trip

• OFF COURSE – Distance from desired track

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• POINTER – Arrow points to your destination

• POSITION – Current position coordinates

• SONAR – Compressed view of sonar data

• SPEED – Speed over ground

• TIME OF DAY – Current time

• TIME TO DESTINATION – Time to ﬁ nal waypoint

• TIME TO NEXT – Time to next waypoint

• TO COURSE – Bearing to desired track

• TOTAL AVERAGE SPEED – Total average speed

• TOTAL TRIP TIME – Total travel time of trip, stopped and moving

• TRACK – Current compass direction of travel

• TRIP ODOMETER – Trip Odometer

• TURN – Directional amount of turn needed to match bearing

• VELOCITY MADE GOOD – Velocity Made Good to destination

• VOLTAGE – Current voltage reading being received by unit

• WATER SPEED – Speed through the water (if equipped with optional speed transducer/sensor)

• WATER TEMP. LOG – Smaller version of the Temperature Log (if equipped with temperature transducer/ sensor)

• WATER TEMPERATURE – Water temperature (if equipped with temperature transducer/sensor)

Reference

Map Page Options

Highlight the ﬁ eld you wish to change

)

NOTE: COMPASS, HIGHWAY and POSITION will only be available on medium and large sized data ﬁ elds.

Choose the type of data

you wish to display.

Page 38

Distance and Bearing

Cursor Coordinates

Map Cursor

Reference

Map Page Options

Single, large data ﬁ eld

Default, medium ﬁ elds

Split, small ﬁ elds

Full screen map shown (with BlueChart data)

You may also choose to ‘merge’ the four medium, default data ﬁ elds to a single, large ﬁ eld for better readability, or ‘split’ any or all of the default data ﬁ elds to show 4 small data ﬁ elds. This option is available from any of the main pages with the exception of the Numbers Page. One the Numbers Page, you may split each of the 3 large data ﬁ elds into 4 medium ﬁ elds, for a total of 12 data ﬁ elds.

To split or merge the Numbers ﬁ elds:

1. While in ‘Change Numbers’ mode, highlight the data ﬁ eld you want to change and press MENU.

2. Choose ‘Split Number’ or ‘Merge Numbers’, then press ENTER. You will now see four new data ﬁ elds or one large ﬁ eld. Press QUIT when done.

3. To return to the factory conﬁ guration, repeat the above steps, but instead choose ‘Defaults’, then press ENTER. Press QUIT when done.

• Measure Distance — allows you to measure the bearing and distance between any two points on the map display.

To measure the bearing/distance between two points:

1. Highlight the ‘Measure Distance’ option and press ENTER. An on-screen pointer appears on the map display at your present position with ‘ENT REF’ below it.

2. Move the cursor to the desired reference point (the point that you want to start measuring from) and press ENTER.

3. Mov

e the cursor to the point that you want to measure to. The bearing and distance from the reference point, will be displayed in the data window below the data ﬁ elds, along with the cursor’s coordinates. Press the QUIT key to ﬁ nish.

• Show Sonar/Show Numbers — toggles between a Map Page with Sonar information on the top portion, or a Map Page with data ﬁ elds on the top of the display.

To show sonar or show data ﬁ elds:

1. Highlight either the ‘Show Sonar’ or ‘Show Numbers’ option and press ENTER. The Map Page will now be split with sonar and depth information or data ﬁ elds showing on the top.

Page 39

• Size Split — enables height adjustment of the Map Page sonar split screen. You may adjust the size of the map/sonar split window anywhere from 1/3 to 2/3 height from the top of the screen. You must be showing sonar information to use this option.

To resize the Map Page sonar split screen:

1. From the Map Page split screen, press MENU.

2. Highlight ‘Size Split’ and press ENTER.

3. Use the ARROW KEYPAD to move the vertical double-arrow UP or DOWN until the desired horizontal height line shows, then press ENTER.

• Set Up Map — jumps to the Map tab of the Main Menu, allowing you to conﬁ gure the map display to your preferences, including map detail, map orientation, automatic zoom, and various map items

Double-Arrow

Adjusting the split map/

and points. The map set up option uses a ‘ﬁ le tab’ feature, making it easier to organize the various settings for ease of use. The following lists the settings available under each tab:

General Detail, Orientation, AutoZoom Source Basemap, Data Card Maps Waypoints Waypoints, Active Route Points Spot Soundings, Tide Stations, Services Navaids Symbol Set, Text Size, Light Sectors Nav Line Heading Line, Bearing Line, Course Line Track Saved Tracks, Track Log Other Accuracy Circle, Lat/Lon Grid, Map Outlines

To change a map setup feature:

1. From the Map Page menu, highlight ‘Set Up Map’ and press ENTER.

2. Move LEFT or RIGHT on the ARROW KEYPAD to highlight the desired tab, then UP or DOWN on the ARROW KEYPAD to highlight to the setting you want to change and press ENTER.

3. Move UP or DOWN on the ARROW KEYPAD to highlight to the desired setting and press ENTER. To exit, press QUIT.

Reference

Map Page Options

sonar display

Main Menu— Map Conﬁ guration Tab

Page 40

Reference

Map Page Options

General Tab

Source Tab

Data Card Information page

General Tab

Detail— Most, More, Normal, Less, Least: controls how much map detail you will see. This setting

only applies to any map feature set to “Auto”. Those features which have a speciﬁ ed scale or turned “Off” are unaffected by this setting.

Orientation— North Up: ﬁ xes the top of the map display to a north heading; Track Up: ﬁ xes the top

of the map display to the current track heading; Course Up: ﬁ xes the map so the direction of navigation is always “up” and turns the navigation leg line vertical on the screen.

AutoZoom— On/Off: when “On” the map will automatically adjust the map scale to a lower scale as

you approach you destination point.

Source Tab

Basemap— On/Off: turns the built in basemap on or off. Data Card Maps— On/Off: turns all optional BlueChart/MapSource data loaded on the data card

on or off. The ‘Data Card Maps’ option box shows a list of the optional BlueChart/MapSource data loaded on the data card. Each area is described by name and may be deselected if you do not wish to display the data on the Map Page.

To view data card map information:

1. Highlight the ‘Data Card Maps’ option box and press ENTER.

2. Use the ARROW KEYPAD to scroll through the list of maps.

3. To select/deselect a map, highlight the check box to the left of the name of the desired map. Press ENTER to select/deselect the map. The map is selected and will be displayed on the Map Page when an “9” appears in the box adjacent to that map. You may also press MENU and choose to ‘Show All’ or ‘Show None’ and press ENTER.

4. To display detailed information and notes for each area, highlight the desired name and press ENTER. To view the notes for that area, choose ‘Show Notes’. To scroll through the notes, you may either highlight the notes, press ENTER and press UP/DOWN on the ARROW KEYPAD; or press MENU, choose the desired scroll option and press ENTER.

5. To exit the notes, highlight ‘Next’ to view the notes for the next map area, or highlight ‘Map List’ to return to the map list and press ENTER. Press QUIT to exit.

Page 41

Waypoints Tab— Waypoints/Active Route Text— None, Small, Medium, and Large: controls the screen size of the name. Zoom— Auto, Off, 20 ft.–800 ft., 0.2 nm–800 nm: sets the maximum scale at which the feature

appears on the screen. Some types of data will only show up to certain zoom scales.

Points Tab

Text— None (except Spot Sound), Small, Medium, and Large: controls the screen size of the name. Zoom— Auto, On (Spot Soundings only), Off, 20 ft.–800 ft., 0.2 nm–800 nm: sets the maximum

Navaids Tab

Symbol Set— controls the desired Navaid symbol set. Auto: BlueChart maps are drawn using

Text Size— None, Small, Medium and Large: controls the screen size of the name. Light Sectors— Controls the drawing of light sectors on the map. When enabled, color units

Nav Line Tab

Heading Line— On/Off: draws an extension from the end of the boat icon in the direction of travel. Bearing Line— Auto, Off, 20 ft.-800 ft., 0.2 nm-800 nm: sets the scale at which the Bearing Line

Course Line— Auto, Off, 20 ft.-800 ft., 0.2 nm-800 nm: sets the scale at which the Course Line

— Spot Soundings/Tide Stations/Services/Navaids

scale at which the feature appears on the screen. Some types of data will only show up to certain zoom scales.

symbols similar to the NOAA/NIMA standard; non-BlueChart symbols are drawn using traditional Garmin symbols. Garmin: All maps are drawn using traditional Garmin symbols. NOAA: All maps are drawn using a symbol set similar to NOAA/NIMA. International: All maps are drawn using a symbol set similar to the IALA symbol set.

indicate the actual color of each sector using the color of the light. Monochrome units draw white and yellow sectors as white, and draw blue, red & green sectors as dark gray. Off: no light sectors are ever drawn. Auto: Light sectors appear when you point to them with the map cursor. On: Light sectors are drawn for all lights that have them.

appears on the screen. The Bearing line shows the bearing from your current location to a destination waypoint.

appears on the screen. The Course Line shows a direct navigation line from the point navigation was initiated to a destination waypoint.

Reference

Map Page Options

Waypoints Tab

Points Tab

Navaids Tab

Nav LineTab

Page 42

Reference

Map Page Options

Track Tab

Other Tab

Map Setup Menu Options

Track Tab— Saved Tracks/Track Log Zoom— Auto, Off, 20 ft.–800 ft, 0.2 nm–800 nm.: sets the maximum scale at which the feature

appears on the screen. Some types of data will only show up to certain zoom scales.

Other Tab

Accuracy Circle— On/Off: toggles the circle “On” and “Off”. The circle represents the approximate

accuracy of the unit based on EPE, DOP, and basemap quality. You position will be within the circle.

Lat/Lon Grid— Text: None, Small, Medium, and Large; controls the screen size of the name.

Zoom— Auto, Off, 20 ft.–800 ft, 0.2 nm–800 nm.: sets the maximum scale at which the feature appears on the screen.

Map Outlines— On/Off: toggles the coverage boxes for BlueChart/MapSource data “On” and “Off”.

• Turn Declutter On/Off — toggles between showing spot soundings and map outlines for easier viewing.

Map Setup Menu Options

From the map setup page, you can access the following menu options:

• Defaults— restores settings back to factory settings for the tab highlighted.

• All Map Defaults— restores settings back to factory settings for all tabs.

To restore defaults for map settings:

1. From the Map tab in the Main Menu, highlight the tab you want to restore settings to and press MENU.

2. Highlight ‘Defaults’ (highlight ‘All Map Defaults’ if you want all tabs restored) and press ENTER.

Page 43

Sonar Page

The Sonar Page is where your GPSMAP 188/188C/238 Sounder becomes a powerful ﬁ shﬁ nder/ ﬂ asher. Fish are displayed as colored arches or as ﬁ sh icons in three different sizes. Thermoclines are shown as shades of blue. The area of strongest sonar return (or whiteline) is displayed as solid white. Typically, the bottom will be the primary whiteline. A thin whiteline indicates a soft bottom while a thick whiteline will follow the contour of the bottom and show any objects of reasonable size. For more information on understanding sonar and the display, see page 14 and Appendix I.

Using the Adjustment Menu

The Adjustment Menu allows direct access to the settings and features most commonly used on the Sonar Page. The currently selected option appears in the upper left of the display.

To select an adjustment option from the Sonar Page:

1. Press the ARROW KEYPAD LEFT/RIGHT to scroll through the options in the upper left of the display, then press ENTER to access the desired option’s adjustment window.

OR:

To easily exit any of the adjustment options, press the QUIT key.

To change an Adjustment Menu setting:

1. Select an adjustment option to change using one of the two methods described above. The adjustment window will automatically timeout and disappear when idle for 20 seconds.

2. Press the ARROW KEYPAD UP/DOWN to place the pointer or setting bar at the desired setting, range or percentage (Off, 1-100%).

3. Press ENTER or QUIT to exit the adjustment window; or press LEFT/RIGHT on the ARROW KEYPAD to view another adjustment window.

Reference

Sonar Page

Adjustment Menu

Sonar Page

Press MENU and highlight ‘Adjustments’ to see a list of all options and their current settings.

Page 44

Reference

Sonar Page:

Adjustment Menu

Zoom Adjustment

Range Adjustment

4X Split Zoom Display (Dual Frequency Mode)

To change a setting back to ‘Normal’ or ‘Auto’:

1. On the adjustment window for the desired option, press MENU.

2. Select the desired setting and press ENTER.

Adjustment Menu Options

Range— sets the display depth range used for viewing. The unit can be set to automatically track the bottom or set to a user-speciﬁ ed depth range. Auto mode displays the most information possible while continuously showing the bottom.

Zoom— used to quickly select a display zoom scale or split the display. When a scale other than ‘No Zoom’ is selected, the Adjustment Menu displays a new selection labeled ‘View.’ The Zoom setting is divided into six display levels:

• 2X Split: shows two reduced-size sonar pictures at the same time. The right half of the display screen shows the complete sonar picture at its original scale. The left half shows a portion of the original picture at 1/2 depth scale.

• 2X Zoom: displays the 2X zoomed picture on the full screen and does not show the original depth scale.

• 4X Split: shows two reduced pictures; the right at the original depth scale and the left at 1/4 the original depth scale.

• 4X Zoom: displays only the 4X zoomed picture on the full screen. However, if ‘Dual Frequency Display’ is set to ‘Split’, then a 50/200kHz split screen will be displayed.

• Btm (Bottom) Split: shows two reduced pictures; the right at the original depth scale and the left showing sonar returns from the bottom up. All target depths will read as a distance form the bottom.

• Btm (Bottom) Lock: displays only the Bottom Lock picture (returns from the bottom up) on the full screen. However, if ‘Dual Frequency Display’ is set to ‘Split’, then a 50/200kHz split screen will be displayed.

Page 45

Once activated, the zoomed picture becomes the Sonar Page display. You may also cycle through the sonar zoom display levels by pressing the IN or OUT keys. The Zoom function can be deactivated by pressing the OUT key until the ‘No Zoom’ setting appears.

View/Span— available when a Zoom scale other than ‘No Zoom’ is selected. The ‘View’ or ‘Span’

setting is used to change the viewing range of a zoomed display. If the Zoom is set to 2X split or 4X

split, only the zoomed portion on the left side of the screen is affected by the change. If the Zoom

is set to Bottom Split or Bottom Lock, ‘Span’ adjusts how far off the bottom the unit displays data.

In Zoom mode, you can control the view of the left side of the split.

Gain— allows you to control the sensitivity of the unit’s receiver. This provides some ﬂ exibility in

what is seen on the display. To see more detail, increase the receiver sensitivity by selecting a higher

gain percentage. If there is too much detail or if the screen is cluttered, lowering the sensitivity may

increase the clarity of the display.

Target Level— adjusts how dark/light a return (or target) is displayed on the screen. A Color Bar

(see also page 39) appears on the right side of the screen as you adjust this setting. The higher the

percentage, the darker the return appears. This setting does not increase/decrease the unit Gain.

Whiteline— controls how the unit displays information about the bottom type (hard or soft).

With the Whiteline ‘Off’, the bottom return displayss as red and contains no information on

bottom hardness. With Whiteline set at ‘Normal’ or 1-100%, the bottom return becomes white

with a red line indicating where the water meets the bottom. To turn the Whiteline Off, press the

ARROW KEYPAD DOWN until the setting bar is all the way at the bottom of the range and reads

“Off”. See page 114 for more detail on this feature.

Frequency— allows you to choose a transducer frequency. Frequency refers to the “pitch” of

the sound that the transducer sends and receives. You may choose ‘200kHz’, ‘50kHz’ or ‘Dual’

frequency.

Reference

Sonar Page:

Adjustment Menu

View Adjustment Gain Adjustment

Target Level Adjustment Whiteline Adjustment

Frequency Adjustment

Page 46

Depth Line Adjustment

Reference

Sonar Page Options

Noise Reject

Adjustment

Sonar Page Menu Options

Scroll

Adjustment

Depth Line— adds a horizontal depth line across the display which is used to measure the depth of underwater objects. The depth of the line appears in a box on the right side of the line. Press UP or DOWN on the ARROW KEYPAD to control the position of the line on the graph. The depth is displayed in a window on the right side of the line. To turn the Depth Line Off, press the ARROW

KEYPAD UP until the setting bar is all the way at the top of the range and reads “Off”.

Noise Reject— helps ﬁ lter unwanted noise from the graph. The ‘Noise Reject’ tool can be turned

‘Off’, set to ‘Normal’ (automatically adjusts for optimum viewing) or to a ﬁ xed 1-100% setting. When setting the Noise Reject tool: the HIGHER the noise rejection setting, the unit is more likely to NOT show ﬁ sh or structure. To turn the Noise Reject Off, press the ARROW KEYPAD DOWN until the setting bar is all the way at the bottom of the range and reads “Off”.

Scroll— adjusts the rate that the graph scrolls from right to left. If you are sitting still or the graph is moving too fast, slowing the scroll rate or pausing it can be beneﬁ cial.

Sonar Page Options

The GPSMAP 188/188C/238 Sounder’s Sonar Page features a menu page that provides access to

additional functions and to layout and data ﬁ eld options.

To display the Sonar Page options:

1. Press MENU.

To select a menu option:

1. Use the ARROW KEYPAD to highlight the desired option and press ENTER.

The following options are available:

• Adjustments — lists the Adjustment Menu options and their current settings (see page 33-35).

To change an Adjustment setting:

1. On the Adjustment options list, use the ARROW KEYPAD to highlight the desired option and press ENTER.

2. Use the ARROW KEYPAD to make the desired change and press ENTER.

Page 47

• Show/Hide Pointer — allows you to reference sonar items and mark underwater waypoints. This makes it easier to ﬁ nd and use an object such as a stump for a future ﬁ shing location. When using this feature, the Sonar Page pauses. The pointer does not move off the paused display and cannot show an area that has scrolled off the screen. The depth is updated while the display is paused, but the unit will not show any new sonar data until the standard Sonar Page is resumed. You may see a discontinuity from where the sonar information stops to where it starts again.

To mark an underwater waypoint:

1. From the Sonar Page, press MENU, highlight ‘Show Pointer’ and press ENTER to pause the screen movement.

2. Use the ARROW KEYPAD to move the cursor onto the target (underwater drop off, stump, etc.) you want to mark. The data window at the top of the screen displays the cursor’s depth, coordinates, and bearing and distance from your current position.

3. Press ENTER/MARK. The New Waypoint page appears with the waypoint’s coordinates, default three-digit name, and pointer depth automatically ﬁ lled in.

4. To change the name, symbol or depth, highlight the appropriate ﬁ eld and press ENTER. Make your changes and press ENTER when done.

5. When done, move the ﬁ eld highlight back to the ‘OK’ prompt and press ENTER.

6. To return to the standard Sonar Page, press QUIT; or press MENU, then highlight ‘Hide Pointer’ and press ENTER.

• Show/Hide Numbers — toggles showing/hiding the data ﬁ elds on the sonar display.

• Change Numbers — allows you to specify the type of data displayed in each data ﬁ eld. For detailed

instructions on changing the data ﬁ elds on the Sonar Page, see pages 26-28.

Reference

Sonar Page Options

Data Window

Pointer

‘Show Pointer’ option enabled

‘Show Numbers’

option enabled

Page 48

Reference

Sonar Page Options

‘Size Split’ Menu Options

Resizing the Split Sonar Display

Fish Symbols Off— All available information will be displayed.

Suspended targets displays as ﬁ sh symbols. Background information will be displayed.

Same as above with the target depth attached.

Suspended targets display as ﬁ sh symbols. No background information will be displayed.

Same as above with target depth attached.

Double-Arrow

• Size Split — enables width adjustment of the Sonar Page split screen. This option is only available when a split screen zoom scale is selected. You may adjust the size of the split window anywhere from 1/4 to 3/4 width of the right half of the Sonar Page.

To resize the Sonar Page split screen:

1. From the Sonar Page split screen, press MENU.

2. Using the ARROW KEYPAD, highlight ‘Size Split’ and press ENTER.

3. Move the horizontal double-arrow LEFT or RIGHT using the ARROW KEYPAD until the desired vertical width line shows, then press ENTER.

4. If you wish to cancel this operation, press QUIT or press MENU, highlight ‘Cancel Resize’ and press ENTER.

• Set Up Sonar — jumps to the Sonar tab of the Main Menu, which contains sonar conﬁ guration settings that should not require frequent change. You may also press MENU twice from any screen, then highlight the ‘Sonar’ tab using the ARROW KEYPAD. Press RIGHT on the ARROW KEYPAD to access the selection ﬁ elds. Each time the Setup Menu is accessed, the unit will return to the last edited selection ﬁ eld.

To change a setting on the Sonar tab:

1. Using the ARROW KEYPAD, highlight the desired ﬁ eld and press ENTER and the available options appears.

2. Highlight the desired setting and press ENTER.

3. Press QUIT to return to the Sonar Page or previous page.

Sonar Tab Options

Fish Symbols — allows you to determine how the graph displays underwater targets and background information. If Fish Symbols are set to ‘Off’, the unit displays all of the available information about the underwater environment. If a ﬁ sh symbol is selected, the graph displays only the information related to that symbol. Actual ﬁ sh returns may not always appear as perfect arches (like in simulator mode), due to the speed, ﬁ sh orientation and/or other conditions.

Page 49

Water Type — since sound waves travel through ‘Fresh’ and ‘Salt’ water at different rates it is necessary to select the ‘Water Type’ to ensure accurate readings on the unit.

Depth Number — controls the efﬁ ciency of the digital depth update rate.’Fast Update’ will update more quickly and is recommended for low-noise, deeper water (>50 ft.). ‘Auto’ is best for shallow water or high noise areas, will have a slower screen update and is best used if you travel a wide variety of depths.

Reference

Sonar Tab Options

If the unit is unable to track the bottom for any reason, the digits in the depth window will ﬂ ash on and off to alert you that the unit is not tracking the bottom.

Scale — controls the depth ‘Scale’ displayed vertically along the right side of the graph. The depth ‘Scale’ can be conﬁ gured to display four different ways: as an ‘Overlay’, in the ‘Corners’, with ‘Basic’ or ‘No Scale’.

Color Bar — shows a gradient scale of the current Target Level setting (see page 35).

Flasher — with the ‘Flasher’ active, a graphic Flasher representation will be displayed on the far

right side of the graph. This graphic Flasher displays structure and bottom returns much the same as a true Flasher. You may ﬁ nd this feature particularly useful when using ‘Fish Symbols’.

Keel Offset — used to offset the surface reading for the depth of a keel. This makes it possible to measure depth from the bottom of your keel instead of from the transducer’s location. Enter a positive number to offset for a keel, or enter a negative number to compensate for a large vessel that may draw several feet of water. The ‘Keel Offset’ will be reﬂ ected in the depth reading.

Map Split Sonar Detail — controls Map Page sonar split range scale. ‘Full Range’ will show entire scale of 2X or 4X left side split of Sonar Page. ‘Maximum Detail’ displays what is shown on the left side of a split sonar screen.

Background Color — (GPSMAP 188C only) sets the background color on the Sonar Page to Black, Blue or White.

Main Menu—Sonar Tab (GPSMAP 188C shown)

Depth Scale (Overlay)

Color Bar

Flasher

Page 50

Reference

Sonar Page Options

Transducer at Surface

Enter (+) positive

number to show depth

from bottom of keel

Keel Offset: Transducer

at Bottom of Keel

Enter (-) negative number to

show depth from surface

Keel Offset:

Calibrate Water Speed — this is only available if you are using a speed-capable transducer/sensor. Calibration is required to ensure that the Water Speed displayed on your unit will be accurate. The unit will automatically use the GPS ground speed, if it is available, for comparison on the calibration. If a GPS ground speed is not available, use either your boat’s speedometer reading (not always accurate) or a stopwatch to determine your speed over a certain distance (distance / time = speed). It is recommended that the calibration take place in water having little or no current.

To calibrate the water speed:

1. On the Sonar tab, use the ARROW KEYPAD to highlight ‘Calibrate Water Speed’ and press ENTER.

2. Bring the boat to a cruising speed. The top ground and uncalibrated water speeds will be shown at the bottom of the calibration window. Note your top water speed, then stop the boat and press ENTER.

3. By default, the top ground speed is automatically shown in the ‘What was your top water speed?’ ﬁ eld. If a ground speed is not available, the top uncalibrated water speed is used instead. If the new speed is correct, highlight ‘OK’ and press ENTER. If you wish to manually enter a calibration, press ENTER on the speed ﬁ eld, enter a new speed and press ENTER.

4. You may also press MENU from the calibration screen and choose ‘Use Top Ground Speed’ to default back to ground speed or ‘Use No Calibration’ to use the speed sensor’s uncalibrated speed.

Calibrating the Speed Sensor

NOTE: If the boat is not moving fast enough or the speed sensor is not outputting a speed, you will see a “Boat Is Not Moving Fast Enough To Calibrate” message at the bottom of the display. Check that the speed sensor wheel is moving or safely increase boat speed. If there is a problem with the speed sensor/unit or if a speed senor is not installed, a “Water Speed Sensor Is Not Working” message appears at the bottom of the display. Check connections of speed sensor cables.

• Page Defaults — restores the Sonar Page settings to the original factory setup.

To restore default settings to the Sonar Tab:

1. Press MENU. With ‘Page Defaults’ highlighted, press ENTER.

Page 51

Compass Page

The GPSMAP 188/188C/238 Sounder features two different navigation pages: Compass and Highway. Whenever a NAV, Follow Track (TracBack), or Follow Route have been activated, the GPSMAP 188/188C/238 Sounder’s Compass Page will guide you to your destination with digital readouts and a graphic compass display, which includes a bearing pointer. Use this page (instead of the Highway Page) when travelling at slower speeds, when making frequent directional changes, or where straightline navigation is not possible due to obstructions or terrain. The middle of the page features a rotating ‘compass ring’ that shows your course over ground (track) while you’re moving. Your present course over ground is indicated at the top of the compass ring. A bearing pointer arrow, in the middle of the

Bearing ‘Bug’

compass ring, and a bearing ‘bug’ indicator on the outside of the compass ring, indicate the direction of the destination (bearing) relative to the course over ground. The compass ring and pointer arrow work independently to show—at a glance—the direction of your movement and the direction to your destination. For instance, if the arrow points up, you are going directly to the waypoint. If the arrow points any direction other than up, turn toward the arrow until it points up, then continue in that direction.

The bearing pointer, bearing bug and/or compass ring may point in various directions when you are stationary or at very low speeds. Once you start moving, the pointer will be correct.

Bearing Pointer

The Compass Page features a menu page that provides access to layout and data ﬁ eld options. The data window, located at the top of the page, provides a user-selectable layout of various types of useful data. Each data ﬁ eld may be conﬁ gured to display several data options. The data window layout may also be changed to display more/less data ﬁ elds and change the actual size of the data displayed.

To change the data ﬁ elds or layout of the Compass Page:

1. Press MENU. With ‘Change Numbers’ highlighted, press ENTER.

2. Highlight the data ﬁ eld you want to change. Press ENTER to select from a list of data to be displayed; or press MENU to split or merge the numbers. Make your selection and press ENTER.

For detailed instructions on changing the data ﬁ elds and layout of the Compass Page, see pages 26-28.

1. Press MENU, then press ENTER.

2. Press MENU again, highlight ‘Defaults’ and press

Reference

Compass Page

Destination

Data Fields

Compass Ring

To restore defaults to the Compass Page:

ENTER.

Page 52

Numbers Page/

Highway Page

Current Nav Point

Data Fields

Route Waypoints

Desired Track Line

Current Position

Zoom Scale

Reference

Numbers Page with the middle data ﬁ eld split into four small data ﬁ elds.

Numbers Page

The Numbers Page provides a quick reference for the important data you want to display. The default page displays three large, user-selectable data ﬁ elds showing a compass ribbon, speed and current position coordinates. You may also choose to show the three data ﬁ elds in large lettering for better readability or you may ‘split’ any or all of the data ﬁ elds to show 4 smaller data ﬁ elds. For detailed instructions on changing the data ﬁ elds and layout of the Numbers page, see pages 26-28.

Highway Page

When a Go To, TracBack, or route has been activated, the GPSMAP 188/188C/238 Sounder’s Highway Page provides digital and graphic steering guidance to the destination. The top half of the Highway Page features user-selectable data ﬁ elds that display useful navigation data. Additionally, a compass ribbon is displayed to show your current heading along with a dark, vertical bar indicates the bearing to your course. To stay on course, steer towards the black vertical indicator (or arrows) until it lines up with the red bar in the middle. The bottom section of the screen provides visual guidance to the waypoint on a graphic highway display. The line down the center of the highway represents your desired track line.

As you head toward your destination, the highway perspective moves to indicate your progress to the waypoint and which direction you should steer to stay on course. If you are navigating a route, the Highway Page shows each route waypoint in sequence connected by a red “road” with a yellow line down the middle, which is your desired track line. Nearby waypoints not in the active route can also be displayed. The highway perspective scale may also be zoomed in or out to display a larger or smaller view of the highway. Five settings are available from 1X to 16X, with a default setting of 8X.

To change the highway perspective scale:

1. Press the ZOOM IN or ZOOM OUT key to select the desired setting.

Highway Page

Page 53

The Highway Page options menu provides access to functions and features relating to the Highway Page and the layout options. The data window, located at the top of the page, provides a user-selectable layout of various types of useful data. Each data ﬁ eld may be conﬁ gured to display several data options. The data window layout may also be changed to display additional data ﬁ elds and change the actual size of the data displayed.

To display the Highway Page options:

1. Press MENU.

To select a menu option:

1. Using the ARROW KEYPAD, highlight the desired option and press ENTER.

The following options are available from the Highway Page menu:

• Change Numbers — allows you to specify the type of data displayed in each data ﬁ eld on the High-

way display. For detailed instructions on changing the data ﬁ elds and layout of the Highway page, see pages 26-28.

• Set Up Highway — jumps to the Hiway tab of the Main Menu, allowing you to select which

waypoints and tracks are shown on the Highway display. Use the

ARROW KEYPAD

and

ENTER

key

to select/deselect the desired options. Four options are available:

• Active Route Waypoints— all active route waypoints.

• User Waypoints— only nearby waypoints to the route.

• Track Log— current active track log.

• Saved Tracks— any saved track logs near the route.

Active Route Page

When a route is activated in the GPSMAP 188/188C/238 Sounder system, the Active Route page will show each waypoint of the active route, along with various, user-selectable types of data. For additional details on the Active Route Page, see page 64.

Reference

Highway Page Options

Check or uncheck the options you wish to show/hide on the Highway Page.

Preview Window

Active Route Page

Selecting the ‘Setup Highway’ option takes you to the Hiway tab of the Main Menu.

Page 54

Reference

Creating Waypoints

Highlight a ﬁ eld and press ENTER to enter a new symbol, name, comment or depth.

Highlight ‘OK’ and press ENTER to use the default name and symbol.

Creating and Using Waypoints

The Garmin GPSMAP 188/188C/238 Sounder stores up to 3000 alphanumeric waypoints with a user-deﬁ ned icon, comments and depth available for each waypoint. Waypoints can be created using three basic methods:

• ENTER/MARK key– used primarily for marking your present position, the ENTER/MARK key also provides options that allow you to select a map position or map item from the map display.

• Graphically– allows you to deﬁ ne a new waypoint position from the map display using the ARROW KEYPAD. (For creating underwater waypoints, see page 37.)

• Text Entry– allows you to enter a new waypoint’s coordinates manually (from a chart, etc.).

Marking Your Present Position

The Garmin GPSMAP 188/188C/238 Sounder’s ENTER/MARK key lets you quickly capture your present position (or cursor or map item position) in order to create a new waypoint. You must have a valid position (2D or 3D) ﬁ x to mark your present position. This can be determined by looking at the GPS tab on the Main Menu.

To mark your present position:

1. Press and hold the ENTER/MARK key until the ‘New Waypoint’ window appears, then release it. You will see a default three-digit name and symbol for the new waypoint.

2. To accept the waypoint with the default name and symbol, press ENTER to conﬁ rm the highlighted ‘OK’ prompt.

3. To enter a different name, highlight the name ﬁ eld and press ENTER, then use the ARROW KEYPAD to enter the new letters/numbers and press ENTER when done. You may use up to 10 alphanumeric characters for the name.

4. To enter a different symbol, highlight the symbol ﬁ eld to the left of the name and press ENTER, then use the ARROW KEYPAD to highlight the new symbol and press ENTER.

5. To enter optional comments or a depth, highlight the appropriate ﬁ eld and press ENTER, then use the ARROW KEYPAD to enter a value and press ENTER.

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6. To manually enter a set of coordinates, highlight the coordinates and press ENTER, then use the ARROW KEYPAD to enter the new coordinates and press ENTER when done.

7. When done, use the ARROW KEYPAD to highlight the ‘OK’ prompt and press ENTER to save the waypoint into memory.

Creating Waypoints

Creating Waypoints Graphically

Waypoints may also be quickly created with the Map Page cursor, which allows you to ‘point and shoot’ at any map position or map feature to create a new waypoint. When you move the cursor over a map item, you will see a highlighted description of that item. The GPSMAP 188/188C/238 Sounder uses the map item text shown on the cartography as the default name and symbol for the new waypoint.

To create a new waypoint on an open map location:

1. Use the ARROW KEYPAD to move the cursor to the desired map position.

2. Press and quickly release the ENTER/MARK key to capture the cursor position (press and hold ENTER/MARK to mark your present location, not the map cursor’s position).

3. The ‘New Map Waypoint’ page appears. To accept the waypoint with the default name and symbol, press ENTER.

To change the name, symbol, position, or add a comment or depth, highlight the appropriate ﬁ eld

and press ENTER. Make your changes and press ENTER when done. After entering and conﬁ rming your changes, highlight ‘OK’ and press ENTER.

Creating a waypoint on an open map location.

To create a new waypoint from a map feature:

1. Use the ARROW KEYPAD to move the cursor and highlight the desired map feature.

2. Press ENTER/MARK to capture the cursor position. An Information page for that map feature appears. Use the ARROW KEYPAD to highlight ‘Create Wpt’ and press ENTER.

3. The ‘New Waypoint’ page appears. To accept the waypoint with the default name and symbol (based on the map feature), highlight ‘OK’ and press ENTER.

To change the name, symbol, position, or enter comments or depth, highlight the appropriate

ﬁ eld and press ENTER. Make your changes and press ENTER. After entering and conﬁ rming your changes, use the ARROW KEYPAD to highlight ‘OK’ and press ENTER.

Reference

Using a map item to create a new waypoint.

Page 56

Reference

Creating Waypoints

Select a point from which to project a new waypoint.

Highlight the position ﬁ eld and use the

ARROW KEYPAD

to enter the desired position coordinates.

Additional Options For Creating Waypoints

Waypoints may also be created by manually entering position coordinates through the Points tab of the Main Menu. This method can be useful for creating a waypoint at a speciﬁ c latitude/longitude position from a chart.

To create a new waypoint by entering location coordinates:

1. Press MENU twice to display the Main Menu. Highlight the ‘Points’ tab and press MENU.

2. Highlight ‘Create Waypoint’ and press ENTER. The ‘New Waypoint’ page appears, with the next available waypoint number and the receiver’s last know position as the default name and position.

3. Use the ARROW KEYPAD to highlight the position ﬁ eld and press ENTER. Use the ARROW KEYPAD to enter the desired position coordinates and press ENTER when ﬁ nished.

4. To change the name, symbol, or enter comments, depth or elevation, highlight the appropriate ﬁ eld and press ENTER. Make your changes and press ENTER when ﬁ nished.

5. Use the ARROW KEYPAD to highlight ‘OK’ and press ENTER to save the waypoint.

A waypoint may also be created by “projecting” the distance and bearing from a speciﬁ c location to

a new location. Start by accessing the ‘New Waypoint’ page or the ‘New Map Waypoint’ page.

To create a new waypoint by projecting its location:

1. To project the waypoint from your current location, be sure the ﬁ eld to the right of the word ‘From’ reads ‘Current Position’ (if not, highlight the ﬁ eld and press ENTER, highlight ‘Current Position’ and press ENTER).

2. To select a map location from which to project a waypoint, highlight the ﬁ eld next to ‘From’ and press ENTER. The ‘Find’ screen appears. Highlight ‘Other Position’ and press ENTER. Use the zoom IN key and ARROW KEYPAD to highlight the desired position on the map and press ENTER.

Page 57

3. To select another location from which to project a waypoint, highlight the ﬁ eld next to ‘From’ and press ENTER. The ‘Find’ screen appears. Highlight the desired type of location (waypoints, cities, etc.) and press ENTER. Use the submenus to narrow down your search (for more information see ‘Find’ on pages 38-39). Highlight the desired location and press ENTER. With ‘OK’ highlighted, press ENTER again.

4. Highlight the distance and/or bearing ﬁ elds below ‘From Current Position’ and press ENTER. Use the ARROW KEYPAD to enter the projected distance and/or bearing from your current position for the new waypoint and press ENTER.

5. Make any other desired changes to the new waypoint data (name, symbol, etc.), then highlight ‘OK’ and press ENTER to save the waypoint.

Waypoint Menu Options

Two additional options are available by pressing MENU on the New Waypoint and New Map Waypoint Pages: Append To Route and Move Waypoint. (these menu options also appear on the Waypoint Edit and Waypoint Review pages).

• Append to Route— Adds the new waypoint to the end of a route.

• Move Waypoint— Allows you to move the waypoint to a new location on the map display.

To append a new waypoint to a route:

1. Select ‘Append To Route’ from the options menu.

2. The ‘Select Route’ screen appears. Highlight the desired route or select ‘New Route’ and press ENTER.

3. With ‘OK’ highlighted, press ENTER to save the waypoint.

To move a waypoint:

1. Select ‘Move Waypoint’ from the options menu.

2. The selected waypoint will be centered and highlighted on a map display. Use the ARROW KEYPAD to move the waypoint to the new position and press ENTER. Press QUIT to exit.

Reference

Creating Waypoints

Waypoint Options Menu

Use the ARROW KEYPAD to move the waypoint to a new position on the map.

Page 58

Reference

Reviewing/Editing Waypoints

Waypoint Review Page— Highlight ‘OK’ and press ENTER to exit/save changes and return to the Map Page.

Waypoint Review Page for a waypoint located on multiple map features.

Reviewing and Editing Waypoints

Once you have created and stored a waypoint, it may be modiﬁ ed, reviewed, renamed, moved, or

deleted at any time through the Waypoint Review and Waypoint Edit pages.

To access the Waypoint Review page:

1. Use the ARROW KEYPAD to highlight the desired waypoint on the Map Page.

2. Press ENTER to display the Waypoint Review page. If the waypoint is located on a map feature, or on a MapSource or BlueChart feature, the Waypoint Review page includes additional information tabs about the other features at that location.

To access the Waypoint Edit page:

1. Press MENU twice to view the Main Menu. Use the ARROW KEYPAD to highlight the ‘Points’ tab, then highlight the desired waypoint from the ‘User’ or ‘Proximity’ lists.

2. Press ENTER to display the Waypoint Edit page. If the waypoint is located on a map feature, or on a MapSource or BlueChart feature, the Waypoint Edit page will NOT display the details of the other map features.

From the Waypoint Review and Edit pages, you may change the name, symbol, comment, position coordinates, or depth for the selected waypoint. Once the changes have been made, highlight ‘OK’ (Waypoint Review Page) or ‘Next’ (Waypoint Edit Page) and press ENTER to save them.

To change the waypoint name:

1. Highlight the waypoint name ﬁ eld and press ENTER.

2. Use the ARROW KEYPAD to enter a new name and press ENTER when done.

To change the waypoint symbol:

1. Highlight the waypoint symbol ﬁ eld to the left of the waypoint name and press ENTER.

2. Use the ARROW KEYPAD to select the desired symbol and press ENTER when done.

Page 59

To change the comment/position coordinates/depth:

1. Highlight the desired ﬁ eld and press ENTER.

2. Use the ARROW KEYPAD to edit/enter the data. To drop to the next line, press to the right on the ARROW KEYPAD. Press ENTER when done.

On the Waypoint Review and Waypoint Edit pages, you may also delete the selected waypoint,

view the waypoint on the map, and move the waypoint on the map.

To delete a waypoint:

1. On the Waypoint Review/Waypoint Edit page, use the ARROW KEYPAD to highlight ‘Delete’ and press ENTER. With ‘OK’ highlighted, press ENTER again to conﬁ rm the deletion.

To view and move a waypoint on the map:

1. From the Waypoint Review/Waypoint Edit page, highlight ‘Show Map’ and press ENTER. The waypoint is highlighted on a map screen with an information window that shows the waypoint name, position and distance and bearing from your current position.

2. To move the waypoint, press ENTER. A ‘MOVE’ label will now appears under the cursor arrow. It may be necessary to use the IN and OUT keys to zoom the map.

3. Use the ARROW KEYPAD to move the waypoint to a new position. As you move the cursor around the map display, the information window at the top changes to show the distance, bearing, and position of the map cursor (in relation to the waypoint’s original position), and a description of there the cursor is on the map. If you wish to stop the move process, press QUIT.

4. With the pointer at the desired position, press ENTER. To return to the Waypoint Edit/Waypoint Review page, press QUIT.

On the ‘Show Map’ map display, an additional option is available by pressing MENU:

• Point to on Map Page— returns to the highlighted waypoint on the Map Page (exits the Waypoint Review/Waypoint Edit Page).

Reference

Editing Waypoints

Symbol

Name

Comment

Depth

Coordinates

Waypoint Edit Page

Page 60

Waypoint Lists

Main Menu—Points Tab

Options Menu

Reference

Submenu Tabs

Waypoint Lists

The GPSMAP 188/188C/238 Sounder’s Main Menu Page features two waypoint submenu tabs, ‘User’ and ‘Proximity’, that let you manage a large number of waypoints quickly and efﬁ ciently. The submenu tabs also provide a continuously updated proximity waypoint alarm function that can be used to deﬁ ne an alarm circle around submerged hazards, shallow waters, etc.

To access the waypoint submenus of the Main Menu:

1. Press MENU twice, highlight the ‘Points’ tab using the ARROW KEYPAD, then highlight the desired submenu tab.

User Waypoint List

The ‘User’ submenu of the Points tab displays a master list of all waypoints currently stored in memory. From the User list, you may review, edit, rename or delete individual waypoints, or delete all user waypoints. The total number of stored and available waypoints is displayed at the bottom of the User page, with the stored waypoints arranged in numerical/alphabetical order.

To scroll through and review the waypoint list:

1. With the ARROW KEYPAD, highlight the ‘Points’ tab on the main menu, then highlight ‘User’.

2. Use the ARROW KEYPAD to scroll through the list in the desired direction.

3. Press ENTER to review the highlighted waypoint on the ‘Waypoint Edit’ page (see page 48-49 for detailed information on reviewing and editing waypoints).

4. With ‘Next’ highlighted, press ENTER to return to the list. The ﬁ eld highlight will automatically move to the next waypoint in the list.

The following options are available by pressing MENU while highlighting the Points tab, the User

submenu or one of the User waypoint names:

• Create Waypoint— allows you to create a waypoint. (See pages 44-47)

• Delete Waypoint— deletes selected waypoint from list and any route in which it was used.

• Delete By Symbol— deletes waypoints that use the same symbol.

• Delete All— deletes all waypoints from the unit.

Page 61

)

Once a waypoint is deleted from the list, it cannot be recovered from the unit. It is advisable to backup important waypoints to a computer using an optional PC cable and interface software, save them to a data card, or write them down by hand.

To delete an individual waypoint from the ‘User’ list:

1. Use the ARROW KEYPAD to highlight the waypoint to be deleted.

2. Press MENU, highlight ‘Delete Waypoint’ and press ENTER. OR, press ENTER, highlight ‘Delete’ and press ENTER.

3. Press the ENTER key to conﬁ rm the deletion warning.

To delete waypoints by symbol:

1. From the ‘User’ tab, highlight the waypoint to be deleted and press MENU, then select ‘Delete By Symbol’ and press ENTER.

2. Use the ARROW KEYPAD to highlight the symbol of the waypoint(s) to be deleted and press ENTER.

3. Press ENTER to conﬁ rm. Choose ‘Cancel’ or press QUIT to stop the deletion.

To delete all user waypoints:

1. Press the MENU key to select the options window.

2. Use the ARROW KEYPAD to highlight ‘Delete All’ and then press ENTER.

3. Highlight the ‘OK’ prompt and press ENTER to conﬁ rm.

Proximity Waypoint List

The ‘Proximity’ submenu of the Points tab lets you deﬁ ne an alarm circle around a stored waypoint position, and can be used to help you avoid reefs, rocks, or restricted waters. Up to ten waypoints may be listed, with a maximum alarm radius of 99.99 nautical or statute miles or kilometers. If a proximity alarm circle overlaps with an existing alarm circle, the message ‘Proximity Overlaps Another Proximity Waypoint’ appears. Since the unit will only alert for one of the overlap points, use caution when

You can also search for a waypoint by name:

1. Highlight the name ﬁ eld and press ENTER.

2. Use the ARROW KEYPAD to select the ﬁ rst letter of the name.

3. Move to the RIGHT and enter the second letter if you do not see it on the list below.

4. Repeat this until the name appears. Press ENTER when you see the name.

5. Highlight the name on the list and press ENTER again to review the waypoint. When done, highlight ‘OK’ and press ENTER.

navigating in these areas. If you enter an alarm circle overlap, you will only be alerted to the closest proximity waypoint.

Reference

Waypoint Lists

Name Field

Waypoint List

Page 62

Reference

Waypoint Lists

Proximity Waypoint

Proximity Circle

A dashed circle appears showing the alert boundary for the proximity waypoints.

Proximity Waypoints List

To add a proximity waypoint:

1. Use the ARROW KEYPAD to highlight an empty space on the Proximity list and press ENTER. The ‘Find’ screen appears. Highlight ‘Waypoints’ and press ENTER.

2. Use the ARROW KEYPAD to highlight the desired waypoint from the ‘By Name’ or ‘Nearest’ tab lists. The Waypoint Review page appears for the selected waypoint.

3. With ‘OK’ highlighted, press ENTER to conﬁ rm. The distance ﬁ eld is now highlighted.

4. Press ENTER to begin entry of the proximity radius.

5. Use the ARROW KEYPAD to enter a distance value (to 99.99 units) and press ENTER.

To turn proximity alarms on or off:

1. Use the ARROW KEYPAD to highlight the ﬁ eld below “Proximity Alarm” and press ENTER.

2. Select the desired ‘ON’ or ‘OFF’ setting and press ENTER.

The following options are available from the ‘Proximity’ submenu of the ‘Points’ tab:

• Delete Alarm— removes selected waypoint from proximity list.

• Delete All— removes all waypoints from proximity list.

To display the waypoint menu options:

1. Using the ARROW KEYPAD, highlight the ‘Proximity’ tab and press MENU.

To clear one or all proximity waypoint(s) from the list:

1. Use the ARROW KEYPAD to highlight the proximity waypoint to clear and press MENU.

2. To clear a single alarm, highlight the ‘Delete Alarm’ option and press ENTER.

3. To clear all proximity waypoints, select the ‘Delete All’ option and press ENTER.

4. Use the ARROW KEYPAD to highlight the ‘OK’ prompt and press ENTER to conﬁ rm.

Page 63

Going to a Destination

Using the NAV key, the GPSMAP 188/188C/238 Sounder provides three ways to navigate to a

destination: Go To Point, Follow Route, and Follow Track (TracBack). Once you are actively navigat-

Going to a Destination

ing, you will see a straight line that always runs from your current location to the destination on the Map Page. The easiest method for selecting a destination is the ‘Go To’ function, which lets you select a destination point, then quickly sets a direct course from your present position. If you highlight a point on a list or the map and press NAV, ‘Go To <point name>’ appears in addition to ‘Go To Point’. The ‘Go To’ function can be accessed from any list of points or graphically from the map display.

To activate a ‘Go To’ from a point list:

1. Press the NAV key.

2. Use the ARROW KEYPAD to highlight ‘Go To Point’ and press ENTER.

3. From the ‘Find’ menu, highlight ‘Waypoints’ and press ENTER. (You may also choose to go to other points, such as Cities, Tide Stations, etc. from this list.)

4. Select a waypoint from the ‘By Name’ or ‘Nearest’ list, then press ENTER. To display the Waypoint Review page for the selected waypoint.

5. With the ‘Go To’ button highlighted, press ENTER to begin navigation.

To stop navigation:

1. Press the NAV key. Use the ARROW KEYPAD to highlight ‘Stop Navigation’ and press ENTER.

Choose a waypoint from either the ‘User’ or ‘Nearest’ tab list.

Selecting a ‘Go To’ Graphically

A graphical ‘Go To’ may be used to select one of three items from the map display: an existing waypoint, an on-screen map item (roads, rivers, cities, navaids, etc.), or a new map point (non-map item). If you select a map item as the ‘Go To’ destination, the GPSMAP 188/188C/238 Sounder will automatically use the name of the map item, but the point will not be stored in the waypoint list (see page 45 for creating waypoints using map items). If you select a new map point (non-map item) as the ‘Go To’ destination, the GPSMAP 188/188C/238 Sounder automatically creates or moves a waypoint named ‘MAP’ at the cursor position.

Reference

The waypoint or map item name will automatically appear when highlighted and NAV is pressed.

Page 64

Reference

Going to a Destination/

TracBack Navigation

Highlight ‘Save’ and press ENTER to save an active track log.

‘Go To MAP Point’ allows you to navigate to a spot on the map that is not a waypoint or map item.

To activate an existing waypoint or map item as a ‘Go To’ from the map display:

1. Use the ARROW KEYPAD to highlight the waypoint or map item on the screen and press NAV.

2. With ‘Go To <waypoint name>’, press ENTER.

To activate a new map point (non-map item) as a ‘Go To’ from the map display:

1. Use the ARROW KEYPAD to move the arrow cursor to the desired position and press NAV.

2. With ‘Go To MAP Point’ highlighted, press ENTER.

To stop navigation:

1. Press the NAV key. Use the ARROW KEYPAD to highlight ‘Stop Navigation’ and press ENTER.

TracBack Navigation (Follow Track)

The TracBack function allows you to retrace your path using the track log automatically stored in the receiver’s memory, which eliminates the need to store waypoints along the way. TracBack routes are created by reducing your track log into a route of up to 50 turns and activating an inverted route along those points. Once activated, a TracBack route leads you back to the oldest stored track log point, so it’s a good idea to clear the existing track log before you start your current trip.

To clear the track log and deﬁ ne a starting point for a TracBack route:

1. Press MENU twice to display the Main Menu page.

2. Using the ARROW KEYPAD, highlight the ‘Track’ tab, then highlight the ‘Active’ tab to the right.

3. Use the ARROW KEYPAD to highlight ‘Erase’ and press ENTER.

4. Highlight ‘OK’ and press ENTER.

You must ﬁ rst save the track log before you can use the ‘Follow Track’ feature. The Save feature allows you to store up to 15 track logs from certain times and dates.

To save a track log:

1. From the Main Menu, use the ARROW KEYPAD to highlight the ‘Track’ tab, then highlight the ‘Active’ tab to the right.

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2. Use the ARROW KEYPAD to select ‘Save’ and press ENTER.

3. On the ‘Save Back Through’ window, highlight the desired time, date, or ‘Entire Log’ and press

ENTER.

4. Next, the track will begin saving and then display the ‘Saved Track’ window when done. The default name, distance and number of points (500 max) will be displayed.

To change the name of the saved track, highlight the name ﬁ eld and press ENTER, make your

changes and press ENTER again.

To choose a style (monochrome units) or color (color models) that will be used to display the saved

track line, highlight the ﬁ eld and press ENTER, choose a Color or Style and press ENTER again.

To display the track on the Map and Highway pages, highlight the check box to the left of ‘Show on

Map and Highway’ and press ENTER.

To view the track on the map, highlight ‘Review on Map’ and press ENTER. Press QUIT to exit the

Track Map window.

5. Highlight ‘OK’ and press ENTER to save the track.

To activate a TracBack using the NAV key:

1. Press the NAV key, then highlight the ‘Follow Track’ option and press ENTER.

2. Highlight the track you wish to follow and press ENTER.

3. Choose either ‘Original’, which will navigate you from the start to the end of your trip, or ‘Reverse’, which will navigate you from the end to the start of your trip and press ENTER.

Once a TracBack has been activated, the GPSMAP 188/188C/238 Sounder will take the track log currently stored in memory and divide it into segments called ‘legs’. Up to 254 temporary ‘turns’

(BEGIN, TURN 1, TURN 2, TURN 3,...., TURN X, END) will be created to mark the most signiﬁ cant

features of the track log in order to duplicate your exact path as closely as possible. To get the most out of the TracBack feature, remember the following tips:

• Always clear the track log at the point that you want to go back to (dock, etc.).

• The ‘Record Mode’ option on the track log setup page must be set to ‘Fill’ or ‘Wrap’.

• There must be at least two track log points stored in memory to create a TracBack route.

Reference

TracBack Navigation

Default Track name

Total Distance

Change color or style of track line

Check this box to display track

Total number of points

You must ﬁ rst save a track before using the ‘Follow Track’ option. If there are no saved tracks, the message “There are no saved Tracks to follow” appears after you select ‘Follow Track.’

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Reference

TracBack Navigation/

MOB: Man OverBoard

Highlight ‘Stop Navigation’ and press ENTER to stop navigating.

The MOB function allows you to quickly activate a course back to a location.

• If the track log interval is set to the ‘Time’ option, the route may not follow your exact path (keep the interval set to ‘resolution’ for best performance).

• If the receiver is turned off or satellite coverage is lost during your trip, the TracBack will draw a straight line between any point where coverage was lost and where it resumed.

• If your track log’s changes in distance and direction are too complex, 254 waypoints may not mark your path accurately. The receiver then assigns the 254 waypoints to the most signiﬁ cant points of your track, and simpliﬁ es segments with fewer changes in direction.

To stop TracBack navigation:

1. Press the NAV key, highlight ‘Stop Navigation’ and press ENTER.

For more information on setting up the Track options and saved tracks, see pages 75-76.

MOB Key

The GPSMAP 188/188C/238 Sounder’s Man OverBoard function (MOB) lets you simultaneously

mark and set a course to a position for quick response to emergency situations.

To activate the MOB function:

1. Press the MOB key.

2. Press ENTER to conﬁ rm and begin navigating to the MOB position.

Once a MOB has been activated, a ‘MOB’ waypoint with an international MOB symbol is created and the unit is set on an active navigation to that point. Use any of the Navigation Pages to guide you back to the MOB point. The MOB waypoint is stored in the waypoint list and may be deleted like any other waypoint (see page 50).

To stop navigation to the MOB position:

1. Press the NAV key, highlight ‘Stop Navigation’ and press ENTER.

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Creating a Route

The last way to navigate to a destination is to create a user-deﬁ ned route. The Garmin GPSMAP 188/188C/238 Sounder lets you create and store up to 50 reversible routes (numbered 1-50), with up to 254 waypoints each. Routes can be created in two ways. The ﬁ rst way is by selecting points from the Map Page, allowing you to see each route graphically on-screen as you create the route. The second way is to select waypoints from the Find menu, allowing you to see a list of the route points as you create the route. To create a route, start by accessing the Main Menu.

To create a route graphically:

1. Press the MENU key twice to display the Main Menu page. Use the ARROW KEYPAD to highlight the ‘Route’ tab.

2. Press the MENU key to display the route options page. Select ‘New Route’ and press ENTER.

Or, highlight the ﬁ rst available blank slot in the Route List and press ENTER.

3. To add an existing waypoint or map item to the route, use the ARROW KEYPAD to highlight the desired waypoint or map item on screen and press ENTER. Map items will not appear in the waypoint list. To create a waypoint from a map item, see page 45.

4. To add a new waypoint to the route, use the map cursor to select the desired map position and press ENTER. Press ENTER again to conﬁ rm the new waypoint. You may also change the name, symbol and other properties of the new waypoint (see pages 48-49).

As you add each new waypoint to the route, the data window at the top of the map display will

show the waypoint/map item name, bearing and distance from your location, and coordinates of the cursor. The bottom of the display will show you the number of available and used points. A route line appears on the map to indicate each completed leg, and a dotted line appears to indicate the distance and bearing to the arrow cursor from the last route waypoint.

5. Repeat steps 3 and 4 until you have ﬁ nished deﬁ ning all route waypoints.

6. When ﬁ nished press QUIT twice to return to the Route List page; or press MENU, highlight ‘Edit as Text’ and press ENTER to return to the Route Review page.

Reference

Creating a Route

Main Menu—Route Tab and Route Options Menu

You will see ‘ADD’ below the cursor as you add points.

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Reference

Creating a Route/

Following a Route

Choose a waypoint from either the ‘By Name’ or ‘Nearest’ tab list.

Choose the type of point you want to add to the route.

To create a route using text:

1. Press the MENU key twice to display the Main Menu page. Use the ARROW KEYPAD to highlight the ‘Route’ tab.

2. Press the MENU key to display the route options page. Select the ‘New Route’ option and press ENTER.

Or, highlight the ﬁ rst available blank route slot and press ENTER.

3. Press MENU, select ‘Edit as text’ and press ENTER.

4. Use the ARROW KEYPAD to highlight the ﬁ rst ﬁ eld under the word “Waypoint” and press

ENTER.

5. From the Find menu, highlight ‘Waypoints’ and press ENTER. (You may also choose from other points, such as Cities, Tide Stations, etc. from this list.) Select a waypoint from either the “By Name” or “Nearest” list and press ENTER. (See page 45 for searching for waypoints by name.)

6. On the Point Review or Waypoint Review page, ‘OK’ is automatically highlighted. Choose ‘Show Map’ and press ENTER to view the point on the map, then press QUIT to return to the Waypoint/ Point Review page. With ‘OK’ highlighted, press ENTER to add the point to the route.

7. Repeat steps 4-6 until the desired route points have been entered. Press QUIT to return to the Route List page.

Following a Route

Once a route has been created, it can be activated and used for navigation with the NAV key. A route may be followed in the same sequence as it was originally created, or inverted and followed from the end point back to the beginning point.

To activate and follow a route:

1. From any page, press the NAV key, then using the ARROW KEYPAD, highlight ‘Follow Route’ and press ENTER. (If you highlight a route from the Route List or Route Review page and press NAV, the window will automatically display, ‘Follow <the route name>’.)

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2. Highlight the route you wish to navigate and press ENTER.

3. Choose ‘Activate’ or ‘Invert and Activate’ and press ENTER. (‘Activate’ will use the route as is, ‘Invert and Activate’ will reverse the route then activate it.)

To deactivate (stop navigation) of a route:

1. Press the NAV key, highlight ‘Stop Navigation’ and press ENTER.

Route List Page

The GPSMAP 188/188C/238 Sounder Route List page (‘Route’ tab of the Main Menu) displays all the routes currently stored in memory, along with a descriptive name for each route. By pressing MENU while on the Route List page, the following menu options appear: ‘New Route’ (page 57), ‘Copy Route’, ‘Delete Route’, or ‘Delete All’.

If you highlight a route name from the Route List and press NAV, the name will automatically appear.

To select and follow a route:

1. On the Route List page, use the ARROW KEYPAD to highlight the desired route and press NAV.

2. With ‘Follow <route name>’ highlighted, press ENTER. Highlight ‘Activate’ or ‘Invert and activate’ and press ENTER.

To deactivate (stop following) the route:

1. Press the NAV key, highlight ‘Stop Navigation’ and press ENTER.

To copy or delete a route:

1. From the Route List, using the ARROW KEYPAD, highlight the route you want to copy or delete and press MENU.

2. Choose either ‘Copy Route’ or ‘Delete Route’ and press ENTER and with ‘OK’ highlighted, press ENTER again to conﬁ rm a deletion. Copy will use the same route name with an additional number, starting at 1, at the end of the route name.

To delete all routes:

1. From the Route List, press MENU.

2. Highlight ‘Delete All’ and press ENTER. With ‘OK highlighted, press ENTER again to conﬁ rm.

Reference

Route List Page

Route List Options Menu

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Reference

Route Review Page

Route Name

Data Fields

Route Points

Data Totals

Route Review Options Menu

Route Review Page

Once you have created a route, the Route Review page allows you to edit a selected route.

To access the Route Review page:

1. Press MENU twice and highlight the ‘Route’ tab.

2. Highlight the name of the route you wish to review and press ENTER.

The Route Review page also allows you to enter a 15-character name for any listed route. By

default the name includes the ﬁ rst and last waypoints in the route.

To enter a custom route name:

1. From the Route Review page, highlight the name ﬁ eld and press ENTER to begin editing.

2. Use the ARROW KEYPAD to enter the desired name and press ENTER when ﬁ nished.

Once you are on the Route Review page, you may review the route points (waypoints or map

items) one at a time from the list.

To review individual route points:

1. Highlight the desired point and press ENTER.

2. On the Point Review window, you may choose ‘Next’ (highlight the next point on the route list), ‘Show Map’ (show the point on a map window), or ‘Delete’ (permanently delete the waypoint from the unit) and press ENTER. If the route point is a user waypoint, you may edit any of the waypoint properties on the Waypoint Review page (see pages 48-49 for details).

Once you are back on the Route Point List, the next point in the route is automatically highlighted.

This allows you to review each point on the route by repeatedly pressing ENTER.

Route Review Options Menu

By pressing MENU on the Route Review page, the following options are available: Edit on Map,

Add Before, Remove, and Trip Planning.

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• Edit on Map — review and modify the route displayed for each point (waypoint or map item) on a map page. You may also use the cursor to insert a new route point on a route leg, review the

waypoint or map item.

To edit a route on the map:

1. From the Route Review page, press MENU, highlight ‘Edit on Map’ and press ENTER.

To review a route point:

1. Highlight the point and press ENTER. The Review page appears. Highlight ‘Next’ and press ENTER to return to the map with the next route point highlighted.

To edit a route point:

1. Use the ARROW KEYPAD to highlight the desired route waypoint and press MENU.

A pop-up menu of editing choices appears, with the following options: Edit as Text (return to the

Route Review page), Remove, Move (user waypoints only), and Add.

To remove a route waypoint:

1. Highlight the ‘Remove’ option and press ENTER.

To move a route waypoint:

1. Highlight the ‘Move’ option and press ENTER.

2. Move the cursor to the new map position and press ENTER.

To add points to the beginning or end of the route:

1. With the map cursor, select the ﬁ rst route waypoint (to add waypoints to the beginning of the route) or last (to add waypoints to the end of the route) and press MENU.

2. Highlight the ‘Add’ option and press ENTER.

3. Move the cursor to the new point or position and press ENTER.

4. If you are not adding an existing waypoint, press ENTER to conﬁ rm the new waypoint.

5. Repeat steps 3 and 4 to add additional waypoints or press QUIT to ﬁ nish.

Reference

Editing Routes

Highlight a route point and press ENTER to review it.

Choose ‘Next’ to center the map on the next point in the route. You can step through the points by repeatedly pressing ENTER.

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Reference

Editing Routes

Drag the route leg to an existing waypoint, map item, or an open spot on the map (shown) to create a new route point.

Highlight the route leg on which you wish to insert a waypoint and press ENTER.

The GPSMAP 188/188C/238 Sounder’s route edit mode also allows you to insert a new route point

in any route leg using the map cursor.

To insert a new point between two existing route waypoints:

1. Use the ARROW KEYPAD to select the leg in which you want to insert the new waypoint (the route line will highlight and change to a dotted line when the leg is selected) and press ENTER.

2. Move the cursor to the new map position, existing waypoint, or map item (You will see ’ADD’ below the arrow and the route lines will move with the arrow) and press ENTER.

3. If you are not inserting an existing point, press ENTER to conﬁ rm the new waypoint.

4. Press QUIT to return to the Route Review page.

• Add Before — Insert a waypoint into the route points list.

To insert a point into the route:

1. From either the Route Review or Active Route pages, use the ARROW KEYPAD to highlight the point you wish to insert the new point before and press MENU.

2. Highlight ‘Add Before’ and press ENTER.

3. From the ‘Find’ menu, highlight ‘Waypoints’ and press ENTER. (You may also choose from other points, such as Cities, Tide Stations, etc. from this list.) Select the point you want and press ENTER twice. (See page 51 for searching for waypoints by name.)

• Remove — Remove a point (waypoint or map item) from a route. This option is available from both the Route Review and Active Route Pages.

To remove a point from a route:

1. From either the Route Review or Active Route pages, use the ARROW KEYPAD to highlight the point to remove and press MENU.

2. Highlight ‘Remove’ and press ENTER.

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• Trip Planning — The Route Review and Active Route pages also display trip-planning information for each leg or the entire route. Available information includes Course, ETA, Fuel (to point), Leg Distance, Leg Fuel, Leg Time, Sunrise and Sunset (at point location) and Time To (point).

To use the trip planning feature:

1. Highlight the desired route from the Route List and press ENTER to display the Route Review page.

2. One of nine available planning ﬁ gures appears to the right of each route waypoint and its distance. Use the LEFT/RIGHT keys on the ARROW KEYPAD to select the desired item.

3. To enter planning information (from the Route Review Page only), press MENU and select ‘Trip Planning’ from the options list. Enter the ﬁ gures for Speed, Fuel Flow, Departure Time, and Departure Date.

4. Press QUIT to return to the Route Review Page.

Press LEFT or RIGHT on the ARROW KEYPAD to change the data ﬁ eld.

Reference

Editing Routes

)

NOTE: Fuel ﬂ ow rates on your unit are measured in “units per hour”. System setting changes for units of measure (statute, nautical or metric) do not affect the fuel ﬂ ow measure. You should enter fuel ﬂ ow rates based upon available information for your vehicle (operator’s manual, performance speciﬁ cations, etc.) and make note of the desired units of measure (gallons, liters, etc.).

Trip Planning Data Fields

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Reference

Active Route Page

Whenever you have activated a route in the GPSMAP 188/188C/238 Sounder, the Active Route page shows each point (waypoint or map item) of the active route, with the point name, distance and choice of Course, ETA, Fuel to point, Leg Distance, Leg Fuel, Leg Time, Sunrise and Sunset at point location, or Time To point for each point from your present position. The current destination point, the ‘active’ point, is marked with an arrow icon. As you navigate a route, the point list automatically updates to indicate the next ‘active’ point ﬁ rst. The Active Route and Route Review pages share many of the same features and options.

Active Route Page Menu Options

Active Route Page

Active Route Page Options

The following options are available by pressing MENU on the Active Route page:

• Hide/Show Numbers — see page 26 and 28 for instructions.

• Change Numbers — see pages 26-28 for instructions.

• Edit on Map — see pages 61-62 for instructions.

• Add Before — see page 62 for instructions.

• Remove — see page 62 for instructions.

• Invert — reverses the direction of the route.

• Re-evaluate — recalculates and reactivates the current route data. Selects the route leg closest to

your current position as the active leg (the active leg deﬁ nes the current ‘from’ and ‘to’ waypoints).

To invert an active route:

1 From the Active Route page, press MENU.

2. Using the ARROW KEYPAD, highlight ‘Invert’ and press ENTER to reverse the route.

To re-evaluate an active route:

1 From the Active Route page, press MENU.

2. Using the ARROW KEYPAD, highlight ‘Re-evaluate’ and press ENTER/MARK to recalculate.

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Find Key

The FIND key allows you to search the units for user waypoints, map items, and any optional BlueChart or MapSource information loaded on a data card. Press the FIND key to search for items from your current location by default. You may also search from other locations. When you press FIND, a list of available items to search from appears. The default items are Waypoints, Cities, Tide Stations, and Transportation. Additional items, such as Anchorages, Businesses, Exits, Navaids, Restricted Areas, Wrecks, Obstructions, etc., are displayed depending on the optional BlueChart or MapSource data card inserted into the unit. If you pan around on the Map Page and press FIND, the unit centers its search from the point where the cursor is located. When using BlueChart or MapSource data, your position or the map pointer must be within the map outline area to search for information from that area.

To ﬁ nd a waypoint or other item from your current location:

1 From any page, press FIND.

2. Using the ARROW KEYPAD, highlight the desired category from the list and press ENTER.

3. For Waypoints and Cities, you may search using ‘By Name’ or’ Nearest’. Use the ARROW KEYPAD to highlight the desired tab. For ‘By Name’, you may use the top ﬁ eld to spell out the name or scroll down through the list.

To ﬁ nd a waypoint or item from another location:

1. Once the search results list is displayed for a particular item, press MENU.

2. Highlight ‘Nearest to Other’ and press ENTER. If you are actively following a route, you may also choose ‘Nearest to Next’ or ‘Nearest to Destination’.

3. Select a reference point on the map and press ENTER. The search results list will change to list items nearest to the new map position.

To ﬁ nd a waypoint or item from another location on the map:

1 From the Map Page, use the ARROW KEYPAD to pan to the desired location and press FIND.

2. Using the ARROW KEYPAD, highlight the desired category from the list and press ENTER.

Reference

Find Key

Find Items List From the Current Location

You may also start a ‘Find’ from items found on the Find List or from another location on the map.

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Reference

Find Options

Additional Information Window

Find Menu Options

Additional Information Tabs

Distance, Bearing, Coordinates of item

Additional Option Buttons

To view details about an item:

1. With the desired item highlighted in the search results list, press ENTER.

2. An Information page appears with details about the item organized in a tabbed format. Depending on the type of item, additional options are available for viewing the item on the map, viewing notes on a MapSource or BlueChart map, viewing a tide chart, viewing a list of maps on your data card, and viewing the next item in the search results list.

The Find option supports a “ﬁ nd from” feature, which allows you to center your search around an item that you have just found. For example, you search for “Restricted Areas” and the search shows an “Anchoring Prohibited” search result. If you press FIND again, you will see “From Anchoring Prohibited” as the new search from point. You may also use the Find feature to center your search from any waypoint, route list entry, map item or tide station. Highlight the item you want to Find ‘from’, and press the FIND key.

Find Options

Using the Find options, you may search from various map data and utilize variety of nearest criteria for all items, except waypoints. Available Find options are:

• Nearest To Boat— centers search from your boat’s current location

• Nearest To Other— allows you to choose another map location from which to search.

• Nearest To Next— centers search from the next point of your active route.

• Nearest To Destination— centers search from the last point of your active route.

To ﬁ nd an item using the ﬁ nd options:

1 From any page, press FIND.

2. Using the ARROW KEYPAD, highlight the desired category from the list and press ENTER.

3 From the search results list, press MENU, then highlight the desired option and press ENTER.

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Main Menu Page

The GPSMAP 188/188C/238 Sounder’s Main Menu Page provides access to various waypoint, system, navigation and interface management, and setup menus in an easy to use “tab” format. The Main Menu page is available from any page in the GPSMAP 188/188C/238 Sounder’s system, and is accessed through the MENU key. See pages 2-3 for additional instructions changing settings and entering data.

To access the Main Menu Page:

1. Press MENU twice. The 19 Menu tabs are divided into categories by function.

To select a Menu tab from the Main Menu page:

1. Move the ARROW KEYPAD UP or DOWN to highlight the tab you want to view. The information for the highlighted tab will automatically appear to the right. If you want to highlight any of the tab items, press to the RIGHT on the ARROW KEYPAD, then move UP or DOWN to select individual items.

2. Press either MENU for additional submenu options or press ENTER/MARK to make changes to the highlighted item. Press LEFT on the ARROW KEYPAD to get back to the Menu tab list. Press QUIT to return to the Main Menu page.

Main Menu Tabs

The Main Menu tabs are:

• GPS – shows satellite status, accuracy, initialize position.

• Tide – shows 24 hour tide chart with levels and times.

• Trip – provides trip speeds, odometers, averages, and trip timers.

• Celes – shows sun/moon time cycles and positions.

• Points – allows you to create, edit or delete waypoints. See pages 50-52.

• Route – allows you to create, edit, activate or delete routes. See pages 57-63.

• Track – lets you record a track, deﬁ ne how it is recorded and displayed.

• DSC— allows you to control the Digital Selective Calling (DSC) interface.

• Card – interface control for saving waypoints, routes and tracks to a data card

• Time – sets up time format, time zones, and daylight savings. (continued)

Reference

Main Menu Page

Submenu Tabs

Main Menu Page

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Accuracy

Sky View

Signal Strength Bars

Reference

Main Menu: GPS Tab

Main Menu— GPS Tab

Center dot - 90° above the horizon

90°

Inner ring- 45° above the horizon

45°

Receiver Status

DOP

Differential Status

Outer ring the horizo

• Pages – enables main pages to be shut off, turned on, or ‘jumped to’.

• Map – sets up Map Page features, zooms, and text size. See pages 29-32.

• Temp – sets up and shows the water temperature log.

• Hiway – sets up Highway Page features. See pages 42-43.

• Sonar – sets up Sonar Page features, speeds and calibrations. See pages 38-40.

• Systm – deﬁ nes beeper and simulator, restores setup, and displays software version.

• Units – deﬁ nes position format, datum, heading, and distance and speed units.

• Comm – interface settings for use with a PC or second device.

• Alarm – sets up alarms for anchor drag, arrival, off course, and clock.

GPS Tab— provides a visual reference of satellite acquisition, receiver status, and accuracy. The status information will give you an idea of what the receiver is doing at any given moment. The sky view and signal strength bars give you an indication of what satellites are visible to the receiver and whether or not they are being tracked. The signal strength is shown on a bar graph for each satellite, with the satellite number below. As the receiver locks onto satellites, a signal strength bar appears for each satellite in view. The progress of satellite acquisition is shown in three stages:

• No signal strength bars— the receiver is looking for the satellites indicated.

• Light/White signal strength bars— the receiver has found the satellite(s) and is collecting data.

• Dark/Green signal strength bars— the receiver has collected the necessary data and the satellite(s) are ready for use.

As soon as the GPSMAP 188/188C/238 Sounder has collected the necessary data from the best satellites in view to calculate a ﬁ x, the status ﬁ eld will indicate a 2D or 3D status. The unit will then update the position, date and time.

You can use the sky view to help determine if any satellites are being blocked, and whether you have a current position ﬁ x (indicated by a ‘2D’,‘2D Differential’,‘3D’, or ‘3D Differential’ in the status ﬁ eld). The sky view shows a bird’s-eye view of the position of each satellite relative to the receiver’s last known position. The outer circle represents the horizon (north up), the inner circle 45º above the horizon, and the center point a position directly overhead. You can also set the sky view to a ‘Track Up’

conﬁ guration, causing the top of the sky view to align along your current track heading.

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WAAS Capability

The GPSMAP 188/188C/238 Sounder is capable of receiving WAAS (Wide Area Augmentation

System) satellite signals. WAAS is an FAA (Federal Aviation Administration) funded project to improve

Main Menu: GPS Tab

the overall accuracy and integrity of the GPS signal for aviation use, but land/sea based users may also beneﬁ t from this system. At this time, the system is still in the development stage and is not fully operational. There are currently two WAAS satellites that can be received in the U.S.A., one over the Atlantic Ocean and one over the Paciﬁ c Ocean, in a geo-stationary orbit over the equator. Effective use of the WAAS satellite signal may be limited by your geographic location in relation to those satellites, now in developmental service. WAAS satellite signal reception requires an absolute clear view of the sky and works best when there are no nearby obstructions such as buildings, mountains, etc. WAAS satellites will be numbered 33 or higher when viewing the sky view on your GPSMAP 188/188C/238 Sounder. Initial reception of the WAAS signal may take up to 15-20 minutes, then 1-2 minutes afterwards. When WAAS differential correction has been received for GPS satellites (numbers 32 or below), a ‘D’ appears in the signal bar of the sky view and ‘2D or 3D Differential’ appears in the receiver status. To learn more about the WAAS system, its satellite positions and current state of development, visit the FAA web site (http://gps.faa.gov). Since WAAS requires CPU resources of the GPSMAP 188/188C/238 Sounder to

Highlight ‘WAAS Off’ and press ENTER to disable the WAAS capabilities.

search for and track the satellites, you may disable the WAAS feature to improve unit performance if WAAS reception is not available in your area.

To disable/enable WAAS capability:

1. From the GPS tab, press MENU, then use the ARROW KEYPAD to highlight ‘WAAS Off’ or ‘WAAS On’ and press ENTER.

Receiver Status, Accuracy and DOP

Receiver status is indicated at the top ﬁ eld of the page, with the current Accuracy and Dilution Of Precision (DOP) to the right of the sky view. DOP is an indication of satellite geometry quality measured on a scale of one to ten (lowest numbers the best, highest numbers the poorest). Accuracy uses DOP and other factors to calculate horizontal position accuracy in feet or meters.

Reference

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Reference

Main Menu: GPS Tab

When the GPSMAP 188/188C/238 Sounder is using a differential correction signal (either WAAS or DGPS), a “D” is displayed at the bottom of the signal strength indicator bars for the satellites that are corrected.

The status ﬁ eld will show one of the following conditions:

• Looking For Satellites – the receiver is looking for any satellites.

• AutoLocate – the receiver is looking for any satellite whose almanac has been collected. This process can take up to ﬁ ve minutes.

• Acquiring Satellites – the receiver is looking for and collecting data from satellites visible at its last known or initialized position, but has not collected enough data to calculate a ﬁ x.

• 2D – at least three satellites with good geometry have been acquired and a 2 dimensional position ﬁ x (latitude and longitude) is being calculated. ‘2D Differential’ appears when you are receiving DGPS corrections in 2D mode and a ‘D’ will show on the strength bar of satellites being corrected.

• 3D – at least four satellites with good geometry have been acquired and your position is now being calculated in latitude, longitude and elevation. ‘3D Differential’ appears when you are receiving DGPS corrections in 3D mode and a ‘D’ will show on the strength bar of satellites being corrected.

• Poor GPS Coverage – the receiver is no longer tracking enough satellites for a 2D or 3D ﬁ x.

• Receiver Not Usable – the receiver is unusable, possibly due to interference or abnormal satellite conditions. Turn the unit off and back on to reset.

• Simulating – the receiver is in simulator mode.

The Differential Receiver status will show one of the following:

• Off – No optional beacon receiver attached or enabled in the Comm menu or WAAS Off

• Searching For WAAS – WAAS is enabled and receiver is searching for WAAS signal

• Using WAAS – WAAS capability enabled and unit receiving WAAS corrections

• No Beacon Signal – DGPS receiver attached, but not transmitting RTCM data to GPS

• Tuning Beacon – Receiver is tuning manual DGPS frequency

• Receiving Beacon – Unit is receiving DGPS corrections

• Scanning Beacon – DGPS receiver is scanning for available frequency

• Using DGPS – Indicates a Differential signal is being received (only displays when the Serial Data Format is set to “Other DGPS” on the Comm Tab of the Main Menu)

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The Differential SNR (Signal to Noise Ratio) indicates, on a scale to 0-30db with 30db being the best, the strength of the DGPS signal being received. If no optional DGPS receiver is used with the GPSMAP 188/188C/238 Sounder, the ‘DGPS Rcvr’ ﬁ eld displays ‘Off. The SNR will depend upon the mounting of your DGPS receiver and the distance from the DGPS transmitting station.

The GPS Info tab features an options menu that provides access to functions and features relating to the GPS Info display.

The following options are available by pressing MENU on the GPS Info Tab of the Main Menu:

• Start/Stop Simulator— toggles the unit simulator on or off. Retail Demo mode will restore factory

settings to the unit if left unattended for over 2 minutes. This mode should only be used for display purposes. User waypoints will NOT be deleted.

• WAAS On/WAAS Off— toggles the WAAS capability of the receiver on or off.

• Track Up/North Up— allows you to select between a north up or track up sky view display for the

GPS Info display only.

• AutoLocate— allows the receiver to locate your position automatically. This process can take up to

ﬁ ve minutes.

• Initialize Position— allows you to initialize the receiver graphically on the Map Page to initially

help the receiver acquire more quickly. See pages 4-5 for instructions on initialization.

• Set 2D Elevation— allows you to manually enter the elevation when in 2D or Simulator mode only.

Any elevation entered will be automatically calculated when the GPS is in 3D mode.

To select a menu option:

1. Using the ARROW KEYPAD, highlight the desired option and press ENTER.

Reference

Main Menu: GPS Tab

GPS Tab Options Menu

)

NOTE: If a DGPS receiver is attached to the unit and Garmin DGPS, RTCM In/NMEA Out, or Other DGPS is enable on Port 2, WAAS will be automatically disabled (WAAS Off). It is not possible for the GPSMAP 188/188C/238 Sounder to receive WAAS and DGPS corrections at the same time.

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Reference

Main Menu: Tide Tab

Station Name

Date

Tide Chart

Tide Tab— shows a graphical chart that displays tide station information in a 24-hour span starting at midnight station time. You can choose from different dates and over 3000 tide stations around the USA coastline, Alaska, Hawaii, western Canada and several of the Caribbean islands.

The top of the page displays the tide station being referenced, below that the date. The top of the chart shows a 24-hour block of local time (LCL) for your position, with the reported station time (STA) appearing at the bottom. Daylight (light/yellow bar) and nighttime (dark/blue bar) show across the time scale, with the time progressing from left to right. (Local time scales and sunrise/sunset info may not be available for a few stations). The solid, light vertical lines are in 4-hour increments, and the light, dotted vertical lines are in 1-hour increments. A solid, vertical line (with the current time box at the top) will indicate the time of day when using current date and will intersect the tide graph to show their relation.

Main Menu—Tide Tab

You can select from a list of nearest stations.

Event Times

Local Time

Max. Level

High Tide Curve

Min. Level

Station Time

Current Time Bar

Current Tide Height Bar

Low Tide Curve

Day

Night

The tide curve shows as a shaded area, with higher tides being taller and lower tides shorter. The solid, horizontal line (with the current tide box on the left) indicates the current tide height. The ﬁ gure to the left of the line will show the current tide level in feet. The Mean Lower Low Water (MLLW) appears as a solid, horizontal line near the bottom of the chart (This line will only appear if the tide ranges to the zero value or below). The numbers directly below/above ‘LCL’ and ‘STA’ indicate the maximum/minimum levels, respectively. The four data ﬁ elds below the chart, indicate event times and levels at which the tide changes starting in the upper left ﬁ eld, going downward, then to the upper right and down again.

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To view the chart for a tide station nearest to your current location:

1. From the Tide tab, highlight the ‘At’ ﬁ eld and press ENTER.

2. Press MENU, select ‘Nearest to Boat’ and press ENTER.

3. Select the desired station from the list and press ENTER.

4. Highlight ‘Show Chart’ or ‘OK’ and press ENTER.

If you are not within this range, you will see a message “None Found”. Use the ‘Nearest To Other’

Find option and select a location closer to a tide station.

To ﬁ nd the chart for a tide station nearest to a location on the map:

1. On the Map Page, press FIND, then select ‘Tide Stations’ and press ENTER.

2. Press MENU, select ‘Nearest To Other’ and press ENTER.

3. Use the ARROW KEYPAD and the ZOOM IN/ZOOM OUT keys to select a position on the map and press ENTER.

4. Highlight the desired station from the list and press ENTER to view the information page for that chart (this shows the station’s distance and bearing from the selected map location, along with the station’s position coordinates).

5. Highlight ‘Show Chart’ and press ENTER.

To view the tide chart for another date:

1. With a chart displayed for the desired station, highlight the ‘On (date) ﬁ eld and press ENTER.

2. Enter the desired date with the ARROW KEYPAD and press ENTER.

3. To return to the current date, press MENU, highlight ‘Use Current Date’ and press ENTER.

To view a chart’s details for another time of day:

1. With the desired chart displayed, press MENU, select ‘Move Cursor’ and press ENTER.

2. Press the ARROW KEYPAD LEFT or RIGHT to view the chart at a different time

3. To return to the current time, press MENU, highlight ‘Stop Moving Cursor’ and press ENTER.

Reference

Main Menu: Tide Tab

Tide Station List Menu Options

Press MENU on the Tide Station list to access additional search options. The ‘Nearest to Next’ and ‘Nearest to Destination’ options are enabled when you are actively going to a destination (following a Go To or a Route, for example). You must select a location within 100 nm. of a tide station.

You may move the cursor to see tide heights at different times. Tide data will show in a black box when in cursor mode.

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Reference

Main Menu: Trip Tab/

Celestial Tab

Position

Skyview Window

Sun Position

45°Overhead (90°)

Main Menu— Celestial Tab

Main Menu— Trip Tab

Date/Time

Sun/Moon Event Times

Moon Position

Horizon (0°)20°

Moon Phase

Trip Tab— displays Trip Odometer, Moving Average Speed, Total Average Speed, Maximum Speed, Stopped Time, Moving Time, Total Time, and Odometer.

To reset the trip data:

1. Highlight ‘Reset Trip’, ‘Reset Max Speed’, ‘Reset Odometer’ or ‘Reset All’ and press ENTER.

Celes (Celestial) Tab— displays celestial data for sun and moon rise/set, moon phase, and approximate skyview location of the sun and moon. The moon phase displays the current visible portion of the moon as a light color. You may display this data for your current position, a position from the map, or a Find item location. Also, you may select a different date and time, or use the current data.

To choose another position:

1. From the Celestial tab, highlight the ‘At’ ﬁ eld and press ENTER.

2. The Find menu appears. Make a selection and press ENTER until the information for that location is displayed on the Celestial tab. See pages 65-67 for more information on using the Find feature. List highlight any category, except Other Location, and press ENTER. If you wish to reference a Find item, select from the Find list, and press ENTER.

The location the unit is using appears in the ‘At’ ﬁ eld. The timetables displayed will be based upon your current time zone. When using a position from another location outside of your time zone, you will need to set the Time Zone for that location in the Time tab of the Main Menu (see page 77).

To change the time or date:

1. From the Celestial tab, use the ARROW KEYPAD to highlight the date or time ﬁ eld and press ENTER.

2. Enter a new date or time and press ENTER.

3. To return to the current date and time, press MENU, use the ARROW KEYPAD to highlight ‘Use Current Date and Time’ and press ENTER.

To change the skyview orientation:

1. From the Celestial tab, press MENU, then use the ARROW KEYPAD to highlight ‘North Up’ or ‘Track Up’ and press ENTER.

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Points Tab— contains the ‘User’ and ‘Proximity’ waypoint lists. See pages 50-52.

Route Tab— contains a list of available routes. See pages 57-63.

Track Tab— lets you specify whether or not to record a track log (an electronic ‘breadcrumb trail’

recording of your path), deﬁ ne how it is recorded, or save track log data for future use. The Track Tab also provides an indicator of the memory used for the active track log and options to clear the track memory or start a TracBack route. See pages 54-56 for TracBack information. The Track submenu is divided in two tabs: ‘Active’ tab and the ‘Saved’ tab.

Active Tab

The ‘Active’ tab is for the active log (the log currently being recorded). It displays track memory

used and current settings. For the ‘Active’ tab, the following settings are available:

• Record Mode— lets you select one of three track recording options:

Off— No track log will be recorded. Note that selecting the ‘Off’ setting will prevent you from

using the TracBack feature.

Fill— a track log will be recorded until the track memory is full.

Wrap— A track log will be continuously recorded, wrapping through the available memory

(replacing the oldest track data with new data).

• Interval— deﬁ nes the frequency at which the track plot is recorded. Three interval settings are available:

Distance— records track based on a user-deﬁ ned distance between points.

Time— records track plot based on a user-deﬁ ned time interval.

Resolution— records track plot based upon a user-deﬁ ned variance from your course over

ground. The resolution option is the default setting and is recommended for the most efﬁ cient use of memory and TracBack performance. The distance value (entered in the value ﬁ eld) is the maximum error allowed from the true course before recording a track point.

Reference

Main Menu: Track Tab

Main Menu— Active Track Tab

Main Menu— Saved Track Tab

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Reference

Main Menu: Track Tab

The track name will automatically appear when highlighted on the ‘Saved’ list and NAV is pressed.

Reviewing a saved track

• Value— deﬁ nes the distance or time used to record the track log.

• Save— allows you to save the current active track log.

• Erase— allows you to clear the active track log currently stored in memory.

Saved Tab

The ‘Saved’ tab displays and manages a list of any saved track logs, allows TracBack activation, map display of saved logs. The active log stores up to approximately 2500 track log points, based upon the criteria speciﬁ ed in the Track settings. Up to 15 track logs may be saved in memory, with up to 500 track log points in each saved log.

On the ‘Saved’ tab, the following options are available by highlighting a track and pressing MENU:

• Review On Map – displays the saved track log on a Track Map page.

• Delete Track – deletes highlighted saved track log from memory.

• Delete All – deletes all saved track logs from memory.

To review and edit a track:

1. On the ‘Saved’ Track tab of the Main Menu, highlight the desired track and press ENTER. The Saved Track window appears.

2. You may rename the track, choose to show the track on the Map and Highway pages, delete the track, or view the track on a map window.

3. To exit, press QUIT or highlight ‘Next’ and press ENTER.

You may also activate a TracBack from any of the saved tracks on this tab.

To activate a TracBack from the ‘Saved’ tab list:

1. Using the ARROW KEYPAD, highlight the track you wish to use for a TracBack and press NAV.

2. The ‘Follow <track name>’ will automatically appear highlighted. Press ENTER.

3. Choose either ‘Original’, which will navigate you from the end to the start of your trip, or ‘Reverse’, which will navigate you from the start to the end of your trip and press ENTER.

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DSC Tab— allows to control and set up DSC (Digital Selective Calling) features on the unit.

Reference

What is Digital selective calling (DSC)?

Digital Selective Calling (DSC) uses marine VHF radio and Global Positioning System (GPS) technologies to transmit and receive location information. DSC is used by mariners to assist them in two major areas: Distress Calls and Position Reporting.

An emergency DSC Distress Call allows a vessel in trouble to transmit a substantial amount of information in a single transmission or “call,” without the need for voice communication. When any nearby rescuer receives the DSC signal, an alarm sounds and they immediately receive the position of the caller. The rescuer may then choose to navigate (Go To) the caller’s position to assist or forward the call on to the Coast Guard. When the Coast Guard receives the call, they can immediately access the caller’s information (such as who they are and the type of vessel) in their database while they are in transit to the caller’s position.

A non-emergency DSC Position Report allows mariners to exchange and display the positions of one another. Once a DSC position is received, the mariner may choose to create a waypoint or to show the received position on an electronic map.

Any time a vessel receives a DSC call, they can store that location and quickly navigate to that position using a Go To. This makes DSC a time-saver, especially in an emergency situation. In order to use DSC, users must ﬁ rst register their VHF radio with the FCC and receive a Maritime Mobile Service Identity (MMSI) number.

What is A Maritime mobile service identity (MMSI)?

Maritime Mobile Service Identity (MMSI) basically allows a VHF radio to act like a phone. In order to make a “call” on a phone, you ﬁ rst need a phone number to dial. The 9-digit MMSI number acts like a phone number when used in a Position Report and as a unique identiﬁ er to the Coast Guard when used in an emergency Distress Call. In order to to obtain a Maritime Mobile Service Identity (MMSI) number, users must register their VHF radio with the FCC (Form 605). Garmin does not supply this

number!

Main Menu: DSC Tab

DSC Tab

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Reference

Main Menu: DSC Tab

HOW ARE MMSI ASSIGNMENTS OBTAINED?

Non-commercial users (e.g. recreational users who remain in domestic waters and only carry VHF, EPIRB (Emergency Position Indicating Radio Beacons), and Radar) are not required to have a FCC ship station license. The FCC and Coast Guard have authorized some second and third party vendors to assign MMSI numbers. This service is limited to registering recreational vessels only. To receive information on how to obtain a recreational MMSI number please contact: http://www.uscg.mil/ rescue21/links/mmsi.htm or http://wireless.fcc.gov/marine/.

U.S Non-Federal User: Commercial users, or those who travel outside the U.S. or Canada, must apply for a ship station license, or an amendment to a ship station license. To ﬁ nd out if you require a Ship Station license contact: http://wireless.fcc.gov/marine/fctsht14.html. If your vessel requires licensing by the FCC you will obtain a MMSI during the application/licensing process when you ﬁ le FCC Forms 159 and 605.

U.S. Federal User: Federal users can obtain MMSI assignments from their agency radio spectrum management ofﬁ ce. These procedures are currently under review by the NTIA (National Telecommunications and Information Administration).

Outside the U.S.: Users can obtain an MMSI assignment from their telecommunications authority or ship registry, often by obtaining or amending their ship station license.

In Canada: Industry Canada is responsible for assigning MMSI numbers to commercial and recreational vessels. Information is available at the following web site: http://apollo.ic.gc.ca/english/ mmsi.html.

For more information regarding MMSI’s visit: http://www.navcen.uscg.gov/marcomms/gmdss/ mmsi.htm.

HOW CAN GARMIN HELP YOU WITH DSC?

To receive Distress Calls or Position Reports, you must have a DSC-equipped chartplotter as well as a VHF radio with DSC support. During normal, non-emergency Position Report communication, Channel 70 (156.525 MHz) has been set aside as the VHF/DSC digital call channel. For a Distress Call, a mariner presses the MayDay button on their VHF radio. The call transmits on an emergency channel with the

Page 89

MMSI number attached to the call (if you have DSC support). Any DSC-equipped mariner (on sea or land) within range can receive the call.

When the Garmin GPSMAP 188/188C/238 is connected to a VHF with DSC support, the GPS unit displays a Call List, Log, and a Directory available to store incoming information received from another user’s DSC capable VHF/GPS combination. Basic wiring is required for the Garmin unit and VHF radio to send and receive NMEA data from each other (pg.87).

Distress Call

With a Garmin DSC capable chartplotter/sounder properly connected to a VHF radio with DSC output, you may receive any DSC Distress Call within range. A window will pop up and a message displays when a Distress Call is received. To notify you a Distress Call has been received, an alarm will sound (if enabled). The alarm only

sounds on a Distress Call, and it will not sound on a Position

Distress Call Message

Report. Distress Calls are broadcasted to all DSC users in radio range.

Options available from this screen are:

• Show on Map: If you immediately wants to see the caller’s position they select ‘Show on Map’.

• Create Waypoint: If you want to create a waypoint of that posistion, highlight ‘Create Waypoint’ and press ENTER/MARK.

You also have the ability to input a caller’s name, if it is known. (The caller’s name replaces the

MMSI number as a reference once it is entered.)

DSC Position Report

The Position Report operates similarly to the Distress Call. Remember this type of contact is like a phone call, but no emergency alarms are set off and the call is speciﬁ c to the receiver. Position Reports are not broadcasted to all DSC users.

Reference

Main Menu: DSC Tab

Position Report Message

Page 90

Reference

Main Menu: DSC Tab

DSC Entry Review

DSC Log

DSC Call List

The DSC Call List displays the current calls received. The GPS can manage up to 50 calls. When ‘calls’ are received, they are updated constantly to give the most current information, even if the unit is left unattended. Any entry from the Call List can be selected to show an Entry Review.

DSC Log

When DSC calls are received, they are automatically stored in the Log, with the latest call at the top. The unit may store up to 100 logs. Once 100 logs are received, the oldest log ﬁ le is removed when a new call is received. The Log displays information of call Type, Date/Time, Position, and MMSI/Name. Pressing MENU from this page allows you to ‘Sort By Time’, ‘Sort By Name’, ‘Sort By (Call) Type’, ‘Delete’ (only after highlighting a particular call), and ‘Delete All’.

To Review a Call:

1. From the DSC tab of the Main Menu and the Log or Call List tab highlighted, press DOWN Arrow Keypad until the call you want to review is highlighted.

2. Press ENTER/MARK to select the call.

DSC Entry Review

The DSC Entry Review operates similarly to the Distress Page and Position Report Page. This page has the additional option to ‘Delete’ the displayed call. From the DSC Entry Review, you can ‘Delete’ the entry, ‘Show on map’, or ‘Create Waypoint’.and create a name for the entry.

DSC Directory

The DSC Directory acts much like a phone book. A user can save up to 50 contacts. The directory lists by Name and MMSI number. Pressing MENU from this page allows you to create a ‘New Item’, ‘Delete Item’, or ‘Delete All’.

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There are two ways to add a new entry into the directory.

To add a new Directory entry:

1. Press Menu, then highlight ‘New Item’ and press ENTER/MARK.

2. Or, with the Directory Tab highlighted press the Arrow Keypad DOWN, highlight an empty ﬁ eld and press ENTER/MARK to access the New Directory Item window.

The New Directory Item window allows you to input information of a known contact.

To add the MMSI number, Name, or Comment:

1. Press UP/DOWN on the Arrow Keypad to highlight the MMSI, Name, or Comment ﬁ eld.

2. Press ENTER/MARK to highlight the ﬁ rst digit on that ﬁ eld.

3. Press UP/DOWN on the Arrow Keypad to enter the numbers/letters.

4. Press LEFT/RIGHT on the Arrow Keypad to move to the next position.

5. Press ENTER/MARK to accept the entry.

6. Press UP/DOWN on the Arrow Keypad, highlight the ‘Delete’ button and press ENTER/MARK to delete the entry, or highlight the ‘OK’ button and press ENTER/MARK to accept the entry.

After creating a New Directory Item entry, the name created is attached to that particular MMSI number. If you return to the Log, the new name is displayed under the corresponding MMSI number. Another way to input a name is from the Entry Review page or the DSC Distress Call or DSC Position Report pages. The Name ﬁ eld is only available in the GPS. Names cannot be sent like the MMSI numbers to other DSC users.

DSC Setup

Garmin chartplotters have the ability to turn DSC ‘On’ or ‘Off’. This option is beneﬁ cial for users who have more than one GPS chartplotter. If you want only DSC to display on a particular chartplotter, turn DSC off on the remaining Garmin chartplotters that support DSC.

Reference

Main Menu: DSC Tab

Adding a Directory Entry

DSC Setup

“Simulate..” options only appear while in Simulator mode..

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Reference

Main Menu: DSC/Card Tabs

Card Tab

A user also has the ability to simulate a Distress Call or a Position Report on this page. This is helpful for practice before connecting to the real system. The Distress Call simulator also helps to check if alarms are working properly.

To run a simulation:

1. Place the chartplotter into simulation (see pg. 7).

2. From the Main Menu, select the DSC tab, then highlight the Setup tab.

3. Highlight which simulation you wish to run and press ENTER/MARK.

Using the NAV Button

The receiver of a Distress Call or Position Report can quickly navigate to the caller using the NAV button. Once the call is logged, press the NAV button and select to Go To the MMSI number or the Name of the caller.

Card Tab— interface control for saving waypoints, routes and tracks to a data card.When data is saved to a data card, it may be exchanged with other compatible units and Garmin’s MapSource PC program.

To transfer data to/from a data card:

1. Insert the data card. If there is already user data on the card, highlight ‘User Card’ and press ENTER/MARK. From the ‘Card’ tab, select the checkbox next to each type of item you want to transfer. You may also press MENU and choose to ‘Select All’ or ‘Clear All’.

2. Highlight ‘Save To Card’ and press ENTER/MARK to save the selected items to the data card.

3. If transferring data from the card to the unit, highlight ‘Merge From Card’ and press ENTER/MARK to combine the selected items with those of your GPS. highlight ‘Replace From Card’ and press ENTER/MARK to overwrite all selected items on your GPS.

4. A ‘Transfer Complete’ message appears once the data has been transfered. Press ENTER/MARK.

Page 93

Time Tab— displays the current time and date, allows you to adjust the 12 or 24-hour time format, enter a time zone, and adjust for daylight savings to show correct local time.

The following options are available:

• Time Format – choose from 12 or 24-hour (military) time format.

• Time Zone – choose your correct time zone to show correct local time or enter a UTC Offset. The UTC (also called Greenwich Time) offset is how many hours you are ahead or behind the time line. See the table on page 110 for time offsets.

• Daylight Savings – choose from ‘Auto’, ‘On’, or ‘Off’ to adjust for daylight savings.

Pages Tab— allows you to turn any of the main pages on/off, ‘Jump To’ a particular page, set which page appears ﬁ rst when you power the unit on, and enable/disable the GPS Info on power up screen.

To select/deselect a main page:

1. Use the ARROW KEYPAD to highlight the box to the left of the page name. Press ENTER to select/deselect that page. When a page is selected a ‘9’ appears in the box. You must leave at least one page checked.

You may also press MENU and choose from one of the following and press ENTER:

• All Pages – selects all pages.

• Chart Plotter Only – selects Map page only.

• Navigation Tools Only – selects Compass, Numbers, Highway, and Active Route pages only.

• Basic Fishﬁ nder – selects Sonar page only.

• Defaults – selects all pages.

To ‘Jump To’ a speciﬁ c page:

1. Use the ARROW KEYPAD to highlight the ‘Jump To’ button to the right of the desired page and press ENTER.

To set the ﬁ rst page:

1. Use the ARROW KEYPAD to highlight the ‘First page’ option and press ENTER. Highlight the page you wish to appear ﬁ rst and press ENTER.

Main Menu—Pages Tab

Reference

Main Menu: Time Tab/

Pages Tab

Selectable Data Fields

Non-Selectable Data Field

Main Menu—Time Tab

First Page Option

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Reference

Main Menu: Temp Tab/

System Tab

Main Menu—Temp Tab

Main Menu—System Tab (Normal Mode)

Time Duration

Temperature Scale

Map Tab— contains setup options for the Map Page. See pages 29-32.

Hiway Tab— contains setup options for the Highway Page. See pages 42-43.

Temp (Temperature) Tab— displays the water temperature log (if equipped with a temperature

transducer/sensor). The chart reads from right to left, so that the most recent temperature measured is displayed on the far right side of the chart. The dotted lines within the chart indicate intervals in the temperature scale and the duration of time.

The following settings are available:

• Temperature Scale – sets the temperature range (in degrees) for displaying the log. Select ‘Auto’ to have the unit automatically determine the best range, or select a span of 2, 4, 6, 8 or 10 degrees.

• Time Duration – sets how fast or slow the temperature log scrolls; the shorter the time duration, the faster the temperature log scroll. Select a duration from 1 minute to 2.5 hours.

Sonar Tab— contains setup options for the Sonar Page. See pages 38-40.

Systm (System) Tab— controls system settings for beeper, speed ﬁ lter, languages, system mode,

simulator controls, restores factory settings, and displays software version.

The following settings and options are available:

• Beeper – controls audible beep. Select from ‘Off’, ‘Alarms Only’ (sounds for alarms/messages), or ‘Key and Alarm’ (sounds for key presses and alarms/messages).

• Speed Filter – averages speed-readings. Choose from ‘Off’, ‘Auto’ (automatically controls ﬁ ltering), or ‘On’ (allows you to enter a value from 1 to 255 seconds).

• Language – select from various languages for the unit’s on-screen display.

• System Mode – select from ‘Normal’ (Normal Navigation) or ‘Simulator’ (For practice ONLY), Sounder Only, or GPS Only.

Set Position* – allows to set your location while in simulator mode. See page 11, starting with

step 2, for additional instructions.

Track Control* – ‘Auto Track’ will steer to the current navigation point. ‘User Track’ allows you to

enter a heading in the ‘Track’ ﬁ eld.

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Track* – lets you enter a heading. Speed* – lets you enter a speed. Transducer* – lets you simulate using a Depth Only, Temp Only, or Temp/Speed transducer. * These ﬁ elds will only appear when the unit is in Simulator Mode.

• System Information – displays the unit’s software, basemap version, and electronic serial number.

Press

MENU for the following options:

• Defaults – restores settings on Systm page to default values.

• All Unit Defaults – restores all settings to Garmin’s original setup values for the entire unit.

Units Tab— deﬁ nes settings for Position Format, Map Datum, Heading, Distance, Speed, Elevation, Depth, and Temperature.

Main Menu—System Tab (Simulator Mode)

The following settings are available:

• Position Format – is used to change the coordinate system in which a given position reading is displayed. You should only change the position format if you are using a map or chart that speciﬁ es a different position format or wish to use a format you are familiar with. The default format is latitude and longitude in degrees, minutes, and thousandths of a minute (hddd°mm.mmm’). The following additional formats are available:

• hddd.ddddd° – latitude/longitude in decimal degrees only

• hddd°mm’ss.s”

– latitude/longitude in degrees, minutes, seconds

• UTM/UPS – Universal Transverse Mercator / Universal Polar Stereographic grids

• British Grid • Dutch Grid • Finnish KKJ27 • German Grid

• India Zones • Irish Grid • Loran TD • Maidenhead

• MGRS • New Zealand • Qatar Grid • RT90

• Swedish Grid • Swiss Grid • Taiwan Grid • User Grid

• W Malayan RSO

For additional information on Loran TD setup, see pages 102-103.

Reference

Main Menu: System Tab/

Units Tab

Main Menu—Units Tab

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Reference

Main Menu: Units Tab

The Units tab settings will affect how navigation information is displayed on the GPSMAP 188/188C/238 Sounder. When in doubt, seek assistance. If you are using a map or chart in conjunction with your GPS, make sure the settings under the ‘Units’ tab of the GPSMAP 188/188C/238 Sounder match that of the map or chart. This information should be displayed somewhere on the map or chart. If the information is not present, contact the map or chart maker to determine what position format, datum, heading and units of measure are being used for the map or chart.

WARNING: If ‘User Mag Var’ is selected, you must periodically update the magnetic variation as your position changes. Using this setting, the unit will not automatically calculate and update the magnetic variation at your present position. Failure to update this setting may result in substantial differences between the information displayed on your unit and external references, such as a magnetic compass

• Map Datum – allows you to manually select the datum reference used to determine a given position. The default setting is ‘WGS 84’. The unit will automatically choose the best datum depending upon your chosen position format. Datums are used to describe geographic positions for surveying, mapping, and navigation and are not actual maps built in the unit. Although over 100 datums are available (as listed on pages 104-105), you should only change the datum if you are using a map or chart that speciﬁ es a different datum.

WARNING: Selecting the wrong map datum can result in substantial position errors.

When in doubt, use the default WGS 84 datum for best overall performance.

• Heading – lets you select the reference used in calculating heading information. You can select from ‘Auto Mag Var’, ‘True’, ‘Grid’ and ‘User Mag Var’. ‘Auto Mag Var’ provides magnetic north heading references which are automatically determined from your current position. ‘True’ provides headings based upon a true north reference. ‘Grid’ provides headings based on a grid north reference (and is used in conjunction with the grid position formats described on page 73). ‘User Mag Var’ allows you to specify the magnetic variation at your current position and provides magnetic north heading references based upon the variation you enter.

To enter a user deﬁ ned magnetic variation:

1. With the Heading ﬁ eld set to ‘User Mag Var’, highlight the heading reference ﬁ eld (immediately to the right) and press ENTER.

2. Use the ARROW KEYPAD to enter the magnetic variation at your current position and press ENTER.

• Distance, Speed and Elevation – lets you select the desired units of measure for distance, speed and elevation readouts in ‘Nautical’ (nm, kt, ft), ‘Statute’ (mi, mh, ft) or ‘Metric’ (km, kh, m) terms.

• Depth – lets you select the desired units of measure for depth in Feet (ft), Fathoms (fa) or Meters (m).

• Temperature – lets you select the desired units of measure for temperature in Fahrenheit (°F) or Celsius (°C).

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Comm (Communications) Tab— lets you control the input/output format used when connecting your GPSMAP 188/188C/238 Sounder to external NMEA devices, a DGPS beacon receiver, a personal computer, another Garmin GPSMAP 188/188C/238 Sounder, etc. If a DGPS receiver is used, WAAS capability will automatically be turned to ‘Off’. The unit supports two input/output ports. See page 95 for more information on wiring and NMEA information. Individual Port settings are:

Port 1:

• Garmin Data Transfer – the proprietary format used to upload/download MapSource data, exchange waypoint, route, track, almanac, and proximity data with a PC or another Garmin GPSMAP 188/188C/238 Sounder. When you select ‘Garmin Data Transfer’, there are 11 Transfer Modes to choose from: Host, Request Almanac, Request Proximity, Request Routes, Request Tracks, Request Waypoints, Send Almanac, Send Proximity, Send Routes, Send Tracks and Send Waypoints.

• NMEA In/NMEA Out – supports the input/output of standard NMEA 0183 data, and sonar NMEA input support for the DPT, MTW and VHW sentences.

• None – provides no interfacing capabilities.

Main Menu—Comm Tab

Data Transfer Progress

Port 2:

• Garmin DGPS – used to connect the GPSMAP 188/188C/238 Sounder with a Garmin DGPS beacon receiver.

• Other DGPS – allows DGPS input using a standard RTCM format, without any output capabilities.

• NMEA In/NMEA Out – supports the input/output of standard NMEA 0183 data, and sonar NMEA input support for the DPT, MTW and VHW sentences. You may also adjust the NMEA output.

• RTCM In/NMEA Out – allows Differential GPS (DGPS) input using a standard RTCM format and also provides NMEA 0183 output.

• None – provides no interfacing capabilities.

To select an input/output format:

1. Select the desired Port tab, then highlight the ‘Serial Data Format’ ﬁ eld and press ENTER.

2. Use the ARROW KEYPAD elect the desired setting and press ENTER.

Reference

Main Menu: Comm Tab

When transferring data between two Garmin units, be sure to always set one to ‘Host’ and use the other unit to either Send or Request the desired data.

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Reference

Main Menu: Comm tab

Status Field

SNR and Distance will show data when signal is received.

You may also manually enter a frequency and bit rate.

To select a transfer mode:

1. Use the ARROW KEYPAD to select ‘Garmin Data Transfer’ in the ‘Serial Data Format’ ﬁ eld.

2. Highlight the ‘Transfer Mode’ ﬁ eld and press ENTER.

3. Use the ARROW KEYPAD to select the desired setting and press ENTER.

You may also adjust the NMEA output to enable/disable certain sentences and adjust the number of Lat/Lon output precision digits. You must have one of the ports set to NMEA In/NMEA Out to use this option. Settings will affect both Port 1 and Port 2 NMEA outputs.

To restore the Serial Data Format settings to the default ‘Garmin Data Transfer’:

1. From the Comm tab, press MENU, highlight ‘Defaults’ and press ENTER.

If ‘Garmin DGPS’ or ‘RTCM In/NMEA Out’ format is selected, additional ﬁ elds are provided to control a Garmin differential beacon receiver directly from your GPSMAP 188/188C/238 Sounder. You may have the unit automatically scan for the DGPS beacon signal or you can enter the beacon frequency and bit rate on the unit and the information will be used to tune the beacon receiver.

To have the unit automatically scan for a frequency:

1. With the unit set to ‘ light the “Beacon” ﬁ eld and press ENTER.

2. Highlight ‘Scan’ and press ENTER. The numbers in the ‘Frequency’ ﬁ eld will change as the unit scans from 284 kHz to 325 kHz, 200 bit rate, then 100, at 6-second intervals.

Garmin

DGPS’ or ‘RTCM In/NMEA Out’, use the ARROW KEYPAD to high-

To restart the scan:

1. Press MENU, highlight ‘Restart Scan’ and press ENTER.

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The “Status” ﬁ eld will show one of the following:

• Tuning – unit is attempting to tune to the speciﬁ ed frequency and bit rate.

• Scanning – unit is automatically scanning through the frequencies and bit rates.

• Receiving – unit is receiving DGPS signal and ready for operation.

• Check Wiring – unit is not making connection with DGPS receiver.

Main Menu: Comm Tab

When the unit is receiving a DGPS signal, the “SNR” (Signal to Noise Ratio) and “Distance” ﬁ elds will show data. The SNR range is 0dB to 30dB, with 30 being the best. The Distance may or may not show data, depending upon the signal being broadcast from the DGPS site.

The DGPS beacon transmitters are operated by the U.S. Coast Guard (or similar government agency in other countries), which is responsible for their accuracy and maintenance. For DGPS transmitter problems or to ﬁ nd the most updated list of frequencies and coverage areas, contact your local USCG, or see their web site at http://www.navcen.uscg.mil/.

NMEA Interface

If you are going to interface the GPSMAP 188/188C/238 Sounder with another piece of equipment (such as a radio or autopilot), the unit needs to be set to output NMEA data. More information on wiring and NMEA data may be found on page 95.

To activate the NMEA data:

1. On either port of the Comm Tab, highlight the ‘Serial Data Format’ ﬁ eld and press ENTER.

2. Select ‘NMEA In/NMEA Out’ and press ENTER.

Reference

Activating NMEA data

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Reference

Main Menu: Comm Tab/

Alarm Tab

Main Menu—Alarm Tab (System Submenu)

Advanced NMEA Setup Page

Advanced NMEA Output Setup

The GPSMAP 188/188C/238 Sounder NMEA data transmission can be customized to change the precision of the Lat/Lon minutes, set up the waypoint IDs, and keep the output rate at two seconds. If the unit is set up to output all of the available NMEA sentences, the output rate may exceed two seconds. The ‘Advanced NMEA Output Setup’ page allows you to turn on/off the GPS status (GSA. GSV), Waypoint/Route (WPL, RTE), and the Garmin Proprietary sentences. See page 95 for more information on wiring and NMEA data.

Lat/Lon Minutes Precision allows you to adjust the number of digits to the right of the decimal point for transmission of NMEA Output, either 2, 3 or 4 digits. The Waypoint ID setting lets you choose to output the waypoint identiﬁ ers as names or numbers.

To set up the Advanced NMEA page:

1. Highlight ‘NMEA In/NMEA Out’ in the Serial Data Format ﬁ eld, and press MENU. Select ‘NMEA Setup’ and press ENTER.

2. To change the settings, place the highlight over the desired ﬁ eld and press ENTER. Make a selection and press ENTER again to accept the selection.

GPSMAP 188/188C/238 Sounder NMEA Sentence Output (NMEA version 2.3 compliant)

Always transmitted: GPRMC, GPGGA, GPGLL, GPBWC, GPVTG, GPXTE, GPRMB Switchable sentences: GPGSA, GPGSV, GPWPL, GPRTE Garmin proprietary: PGRME, PGRMZ, PGRMM

Alarm Tab— contains setting for the unit’s alarms. The Alarm tab is divided into three submenus:

System alarms, Nav alarms, and Sonar alarms.

System Tab

Clock – provides an alarm for the system clock. Enter a time in the time ﬁ eld and turn the alarm on

and off from the control ﬁ eld menu. Remember to enter alarm times in the same time format (UTC or local) you’re using for your system. The unit must be on for the clock alarm to work.