Garmin GPS 12XL User Manual

GPS

12XL

Personal

Navigator

Owner’s

Manual

&Reference

GARMIN (Europe) Ltd. Unit 5, The Quadrangle, Abbey Park, Romsey, Hampshire SO51 9AQ UK Tel: 011-44-1794-519944 Fax: 011-44-1794-519222

Web Site Address: www.garmin.com

All rights reserved. No part of this manual may be reproduced or transmitted in any form or by any means including photocopying and recording, for any purpose without the express written permission of GARMIN.

Information in this document 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.

GARMIN, Personal Navigator, AutoLocate, TracBack, and PhaseTrac12 are all trademarks of GARMIN Corporation and may not be used without the expressed permission of GARMIN.

June 1997 - Part Number 190-00134-00 Rev. C - Printed in Taiwan

INTRODUCTION

GPS 12XL

Packing List

Operator’s

Manual

Thank you for choosing the GARMIN GPS 12XL —the smallest, easiest-to-use GPS navigator for outdoor use! The GPS 12XL represents GARMIN’s continuing commitment to provide quality navigation information in a versatile and user-friendly flexible design you’ll enjoy for years. To get the most from your new GPS, take the time to read through the owner’s manual in order to understand the operating features of the GPS 12XL. This manual is organized into four sections for your convenience:

Introduction gives a quick overview of the manual and contains the

table of contents and the glossary of navigational terms.

Getting Started introduces you to the basic features of the unit and

provides a quick-start orientation to the GPS 12XL.

Reference provides details about the advanced features and opera-

tions of the GPS 12XL by topic.

The Appendix section contains initialization instructions and items

with multiple listings, such as map datums, time offsets, and the

index.

Before getting started with your GPS, check to see that your GARMIN GPS 12XL package includes the following items. If you are missing any parts, please contact your dealer immediately.

Standard Package:

• GPS 12XL Unit • Owner’s Manual

• Wrist Strap • Quick Reference Guide

• Carrying Case • 4 AA Batteries

See your GARMIN dealer for accessories including our PC kit, swivel mounts, external antennas, and power/data cables.

We at GARMIN hope the GPS 12XL will help you meet all of your navigation needs and know it will become a valuable piece of your outdoor gear.

INTRODUCTION

Caution

The GPS system is operated by the government of the United States, 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 GPS 12XL is a precision electronic NAVigation AID (NAVAID), any NAVAID can be misused or misinterpreted and, therefore, become unsafe.

Use the GPS 12XL at your own risk. To reduce the risk of unsafe operation, carefully review and understand all aspects of this Operator’s Manual and thoroughly practice operation using the simulator mode prior to actual use. When in actual use, carefully compare indications from the GPS 12XL to all available navigation sources including the information from other NAVAIDs, visual sightings, maps, etc. For safety, always resolve any discrepancies before continuing navigation.

NOTE: This device meets requirements for Part 15 of the FCC limits for Class B digital devices for home or office use. It has been tested for compliance with all necessary FCC standards. 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 other equipment, which can be determined by turning the equipment off and on, the user is encouraged to try and correct the interference by relocating the equipment or connecting the equipment to a different circuit than the affected equipment. Consult an authorized dealer or other qualified service technician for additional help if these remedies do not correct the problem. Operation is subject to the following conditions: (1) This device cannot cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. The GPS 12XL does not contain any user-serviceable parts. Repairs should only be made by an authorized service center. Unauthorized repairs or modifications could void your warranty and your authority to operate this device under Part 15 regulations.

INTRODUCTION

Table of

Contents

SECTION ONE Introduction

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

SECTION TWO Getting Started

Battery & Remote Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . .4

Keypad Usage & Data Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Primary Page Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7

Power On & Marking a Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Position Page, Map Basics, & Going To A Waypoint . . . . . . . . . . . . . . .9

Compass Page & Cancelling A GOTO . . . . . . . . . . . . . . . . . . . . . . . .10

Clearing the Map Display, Screen Contrast, & Power Off . . . . . . . . . . .11

SECTION THREE Reference

Satellite Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13

Battery Level Indicator, Backlighting, and Emergency Erase . . . . . . . . .14

Position Page & User Selectable Fields . . . . . . . . . . . . . . . . . . . . .15-16

Marking a Position & Position Averaging Function . . . . . . . . . . . . . . .17

Waypoint Pages & Managing Waypoints . . . . . . . . . . . . . . . . . . . .18-23

TracBack Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-25

Creating and Using Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26-30

Using the Compass & Highway Pages . . . . . . . . . . . . . . . . . . . . . .31-34

Map Page, Zooming, & Panning . . . . . . . . . . . . . . . . . . . . . . . . . .35-38

Map Page & Track Log Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . .38-40

Menu Page & Distance/Sun Calculation . . . . . . . . . . . . . . . . . . . . . . .40

System Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-42

Navigation Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43-44

Interface Setup & DGPS Interface . . . . . . . . . . . . . . . . . . . . . . . . .45-46

Navigation Simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

SECTION FOUR Appendices

Appendix A––Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48-49

Appendix B—Specifications & Wiring . . . . . . . . . . . . . . . . . . . . . .50-51

Appendix C—Messages and Time Offsets . . . . . . . . . . . . . . . . . . .52-53

Appendix D—Map Datums . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54-55

Appendix E––Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56-58

INTRODUCTION

Glossary

The GPS 12XL is a powerful navigation tool that can guide you anywhere in the world. To better understand its operation and capabilities, it may be helpful to review the basic terms and concepts briefly explained below.

Other navigation and GPS definitions used in the manual are defined in the appropriate reference sections of the manual.

Almanac Data

Satellite constellation information (including location and health of satellites) that is transmitted to your receiver from every GPS satellite. Almanac data must be acquired before GPS navigation can begin.

Bearing

The compass direction from your position to a destination.

Course Made Good (CMG)

The bearing from the “active from” position (your starting point) to your present position.

Crosstrack Error (XTK)

The distance you are off a desired course in either direction.

Desired Track (DTK)

The compass course between the “from” and “to” waypoints.

Differential GPS (DGPS)

An extension of the GPS system that uses land-based radio beacons to transmit position corrections to GPS receivers.

Estimated Time of Arrival (ETA)

The time of day of your arrival at a destination.

Estimated Time Enroute (ETE)

The time left to your destination at your present speed.

INTRODUCTION

Glossary

Grid

Coordinate system that projects the earth on a flat surface, using square zones for position measurements. UTM/UPS and Maidenhead formats are grid systems.

Ground Speed

The velocity you are traveling relative to a ground position.

Latitude

The north/south measurement of position perpendicular to the earth’s polar axis.

Longitude

An east/west measurement of position in relation to the Prime Meridian, an imaginary circle that passes through the north and south poles.

Navigation

The process of traveling from one place to another and knowing where you are in relation to your desired course.

Position

An exact, unique location based on a geographic coordinate system.

Track (TRK)

The direction of movement relative to a ground position.

Universal Transverse Mercator (UTM)

A grid coordinate system that projects global sections onto a flat surface to measure position in specific zones.

Velocity Made Good (VMG)

The speed you are traveling in the direction of the destination.

Waypoint

A specific location saved in the receiver’s memory.

INTRODUCTION

Battery

Installation

Remote Antenna

Installation

An optional remote antenna may be used with the GPS 12XL. The remote antenna will improve the receiving capabilities of the unit by magnifying weaker signals which the built-in antenna may not be able to use.

The remote antenna is attached by plugging it into the connector on the back of the unit (see above).

Contact your GARMIN dealer for remote antennas and accessories.

Battery Installation

The GPS 12XL operates on 4 AA batteries (included), which are installed at the base of the unit. These batteries provide up to 12 hours of use.

To install the batteries:

1. Remove the battery cover by turning the thumb loop at the bottom of the unit 1/4 turn counterclockwise.

2. Insert the batteries into position. The battery pole you can still see should match the symbol (+ or –) marked on the case.

3. Replace and secure the battery cover by turning the thumb loop 1/4 turn clockwise.

Battery life varies due to a variety of factors, including temperature and backlighting. You may find that lithium batteries provide longer life in colder conditions.

Turns the unit on and off and activates screen backlighting.

Scrolls through the main data pages in sequence and returns display from a submenu page to a primary page.

Captures a position and displays the mark position page.

Displays GOTO page with the waypoint highlighted for GOTO operation. Pressing GOTO twice activates MOB.

Confirms data entry and activates highlighted fields to allow data entry.

INTRODUCTION

Keypad Usage &

Data Entry

DATA ENTRY

The arrow keypad is used for all data entry. Use the

U and D

keys to select letters, numbers, and menu options; use the

R keys to move the cur-

sor forward or backward along the line. Press your entry.

L and

E to confirm

Returns display to a previous page, or restores a data field’s previous value.

Selects alphanumerical characters and menu choices and moves the field highlight from field to field.

Moves the selected character field and moves the field highlight from field to field.

INTRODUCTION

Primary Pages

Before we start the tour, let’s briefly look at the five

primary information pages used for the GPS 12XL.

Switch between pages by pressing either the

keys.

Satellite

Satellite Page

The Satellite Page will allow you to monitor satellite signal reception and strength.

Position

Map

Compass

Satellite Page

The Satellite Page shows satellite positions and signal strength. Satellite positions are displayed using two circles and a center point. The outer circle shows satellites on level with the horizon; the inner circle is 45º above the horizon; and the center point represents satellites directly overhead. Knowing satellite positions will show you the direction of any blocked signals.

The bottom of the page contains a row of signal strength bars corresponding to each satellite being used.

Position Page

The Position Page shows you where you are, what direction you’re heading and how fast you’re going.

The top of the page contains a compass tape which is a graphic representation of your heading. Your track and speed are indicated immediately below.

The graphic compass tape reflects your head-

ing only while you are moving.

Position Page

The rest of the page shows your current position in three dimensions: latitude, longitude, and altitude. A trip odometer and 12/24-hour clock are also provided.

Map Page

The Map Page acts as a window. It allows you to view your position, the “path” you have traveled over, and nearby waypoints.

A diamond icon in the center of the screen represents your current position. As you move, you will see a thin line - called a track log - appear along the path

you have just covered. Names of stored waypoints can also be shown on the map.

The bottom corners of the map will always display your current track and speed. When going to a waypoint, highlighting an on-screen waypoint, or using the panning target crosshair, the corresponding distance and bearing are shown at the top corners of the map. The top of the screen contains the zoom, pan, and configuration fields.

Navigation Page

A navigation page gives you steering guidance when going to a waypoint. The GPS 12XL has two navigation page choices: the Compass Page and the Highway Page. The Compass Page is the default and will be briefly explained here. The Highway Page is covered on pages 35 and 38.

The Compass Page shows the destination waypoint at the top of the page with the bearing (BRG) and distance (DST) to the waypoint shown below. The center of the page contains a compass ring and arrow to show you the direction of the waypoint from the direction you are moving. The bottom of the page gives your track (TRK), speed (SPD), and a selectable field for estimated time to arrival (ETA), estimated time enroute (ETE), course to steer (CTS), crosstrack error, (XTK), velocity made good (VMG), or turn bearing (TRN).

Menu Page

The last primary page is the Menu Page. The Menu Page gives you access to the GPS 12XL’s waypoint management, route, track log, and setup features through a list of submenus.

INTRODUCTION

Primary Pages

Map Page

The Map Page shows your progress on a moving map plotter and gives a bird’s-eye-view of surrounding waypoints.

Compass Page

The Compass Page is the default navigation page and will show you the way to the waypoint from the direction you are moving.

GETTING

STARTED

Getting Started Tour

Power On &

Marking a

Position

The welcome page will be shown while the unit conducts a self test

Now that you’ve seen the primary pages, let’s get started by taking a simple tour to show you the basics about using your GPS 12XL. The tour assumes that your unit has been turned on and that none of the factory settings ( units of measure, selectable fields, etc.) have been changed. If these settings have been changed, the pictures and descriptions you see in this manual may not match what you see on your screen.

Turning the GPS 12XL On

1. Press Buntil the receiver turns on.

The welcome page will appear while the unit conducts a self test. Once testing is complete, the Satellite Page will appear. When sufficient satellite signals have been acquired, the Satellite Page will be replaced by the Position Page.

Marking a Position

GPS is really about marking and going to places called waypoints. Before we can use our GPS 12XL to guide us somewhere, we have to mark a position as a waypoint. (Your GPS 12XL can hold up to 500 waypoints.)

To mark your present position:

1. Press the Mkey. The mark position page will appear, with a default three-digit name for the new waypoint in the upper-left portion of the page.

To rename the waypoint:

Press the UP arrow to move forward through the alphabet or numbers and the DOWN arrow to move backward.

1. Highlight the name field, and press E.

2. Enter the waypoint name ‘HOME’, and press E.

(See pg. 9 for data entry.) The waypoint symbol field will become highlighted.

Each waypoint may also be assigned a custom way-

point symbol for easy waypoint recognition on the map.

To change the waypoint symbol:

1. Highlight the waypoint symbol field, and press E.

2. Select the house symbol, and press E.

3. Move the cursor to the ‘DONE?’ prompt, and press

Using the Position Page

Walk for 3-4 minutes and watch the Position Page. The direction you are moving (track), your speed, trip distance, and altitude are shown on the upper half of the screen. The latitude and longitude of your position are displayed in the middle of the page, with the time of day shown below.

Let’s continue by moving to the next page:

1. Press P.

Map Page

The next page is the Map Page.To ensure we can see our entire trip on the map, lets change the map scale from .2nm (default) to 5nm.

1. Use the arrow keys to highlight the ‘ZM’ field at the top left of the Map Page and press

2. Press the Uarrow until ‘1nm’ is shown and press

The Map Page shows your present position as a diamond icon in the center of the map. The house symbol labeled ‘HOME’ is the waypoint you created and the line connecting the two is your track log.

1. Now turn approximately 90º to your right and continue walking at for another 2-3 minutes. Notice how the display changes, always keeping the direction you are moving at the top of the map (see right).

Going to a Waypoint

Once you’ve stored a waypoint in memory, you may return to it by performing a GOTO. A GOTO is a straight-line course from your present position to the destination you’ve selected. Let’s navigate back to our starting position, the HOME waypoint.

To select a GOTO destination:

1. Press G.

2. Highlight the ‘HOME’ waypoint, and press E.

You’ll notice that you’ll automatically return to the Map Page, and a straight line will connect your current position to the position of the GOTO waypoint.

Let’s continue by moving to the next page:

GETTING

STARTED

Position/Map

Pages & Going

To a Waypoint

The Map Page displays your present position as a diamond icon and provides a real-time graphic “breadcrumb” display of your track right on the screen.

The GOTO waypoint page allows you to select a destination from a list of all available waypoints in the GPS 12XL’s memory.

1. Press P.

GETTING

STARTED

Compass Page

and Cancelling

a GOTO

The GPS 12XL will also provide steering guidance with a Highway Page.

To change the display from the Compass Page, press ENTER twice.

Once a GOTO is activated, the GPS 12XL provides steering guidance until the GOTO is canceled. To cancel a GOTO, highlight the cancel prompt at the bottom of the page and press ENTER.

Destination

Bearing to

Waypoint

Graphic

Compass

Pointer to Waypoint

Track Over

Ground

Selectable Field

Waypoint

Distance to

Waypoint

Speed Over

Ground

Whenever you select a destination waypoint, the GPS 12XL provides graphic steering guidance with the Compass Page (the default navigation page). The “compass ring” in the middle of the page shows your course over ground while you’re moving, with a pointer arrow to the destination displayed in the center. The arrow shows the direction of your destination from the direction you are moving. For instance, if the arrow points up, you are going directly to the waypoint. If the arrow points any other direction (left, right, down, etc.), turn toward the arrow until it points up. Then continue in that direction.

The bearing and distance to a waypoint are displayed at the top of the screen, and your current track and speed are shown below. The default ‘ETE’ field, at the bottom of the screen, is a user-selectable field that can provide a variety of navigation information. We’ll cover more about that field in the reference section (see page 36).

As you get close to ‘HOME’, you’ll be alerted to press PAGE. The GPS 12XL will give you the message “Approaching HOME”. Once you’ve arrived, you’ll notice the distance field will read 0.00.

Cancelling a GOTO

If you decide to stop navigating to the active waypoint, all you have to do is cancel the GOTO.

To cancel an active GOTO:

1. Press the Gkey.

2. Use the arrow keypad to move the field highlight to the ‘CANCEL press

GOTO

’ prompt at the bottom of the page and

Clearing a Cluttered Map Display

After you’ve used the GPS 12XL for a few trips, you may find that your map display has become a bit messy from keeping track of your every move. For practice, let’s clean up the screen by clearing the track log (the plot points left on the Map Page) we’ve just created during the Getting Started tour.

1. Press Por Quntil the Map Page appears.

2. Highlight the ‘CFG’ field and press E.

3. Highlight ‘Track Setup’ and press E.

4. Highlight the ‘CLEAR LOG?’ option and press E. The clear log confirmation page will appear.

5. Use the

6. Press Eto finish.

key to highlight the ‘Yes’ prompt.

Adjusting Screen Contrast

You can access the GPS 12XL’s contrast feature from

the Satellite Page.

To adjust the screen contrast:

1. Press Por Quntil the Satellite Page appears.

2. Press

or Rto adjust the level of contrast, and press

Screen Backlighting

Screen backlighting is available for nighttime use.

Activate backlighting by pressing the

key briefly. Backlighting will remain on for the time specified on the system setup page (See page 42).

Turning the Receiver Off

You’ve now gone through the basic operation of your new GPS receiver and probably know a little more than you think about how it works. We encourage you to experiment with the GPS 12XL until it becomes an extension of your own navigation skills. If you encounter any problems using the unit or want to take advantage of the GPS 12XL’s more advanced features, turn to the reference section.

To turn the GPS 12XL off:

1. Press and hold the Bkey for 3 seconds.

GETTING

STARTED

Clearing the

Map, Adjusting

Contrast, &

Power Off

Highlight the ‘CLEAR LOG?’ prompt and press ENTER to clear the track log.

Note: Once all 1024 points are used during normal operation, the oldest point will be continuously deleted to make room for the latest track log point to be stored.

Pressing the LEFT or RIGHT arrows from the Satellite Page will automatically activate the screen contrast bar.

REFERENCE

Satellite Page

The GPS 12XL Satellite Page will help you determine which satellites are in view, and whether or not any satellites are being “shaded” or blocked from receiving satellite signals (See satellites 07 and 09 above).

By periodically monitoring the signal strength bars at the bottom of the page and the north up sky view, you will be able to see how moving to another area with a clearer view of the sky will improve satellite reception and speed up signal acquisition.

Status

Field

Battery

Indicator

Horizontal Accuracy

Skyview Display

Signal Strength

Indicators

The GPS 12XL’s Satellite Page displays the status of various receiver functions. The status information will help you understand what the GPS 12XL is doing at any given time, and will tell you whether or not the receiver has calculated a position fix.

Sky View and Signal Strength Bars

The sky view and signal strength bars give you an indication of what satellites are visible to the receiver, whether or not they are being used to calculate a position fix, and the signal quality. The satellite sky view shows a bird’s-eye-view of the position of each available satellite relative to the unit’s last known position. The outer circle represents the horizon (north up); the inner circle is 45º above the horizon; and the center point is directly overhead. You can use the sky view to help determine if any satellites are being blocked, and whether you have a current position fix (indicated by a ‘2D NAV’ or ‘3D NAV’ in the status field). You can also set the sky view to a track up configuration by changing the ‘orientation’ option on the Map Page. (See pg. 38 for setup instructions.)

When the receiver is looking for a particular satellite, the corresponding signal strength bar will be blank and the sky view indicator will be highlighted. Once the receiver has found the satellite, a hollow signal strength bar will appear, indicating that the satellite has been found and the receiver is collecting data from it. The satellite number in the sky view will no longer appear highlighted. As soon as the GPS 12XL has collected the necessary data to calculate a fix, the status field will indicate a 2D or 3D status.

Receiver Status

Receiver status is indicated at the top left of the page, with the current horizontal accuracy (estimated position error, in feet or meters) at the top right. The status will be shown as one of the following conditions:

Searching—

the GPS 12XL is looking for any

available satellites in view.

AutoLocate—

the GPS 12XL is initializing and collecting new almanac data. This process can take 5 minutes, depending on the satellites currently in view.

Acquiring—

the receiver is collecting data from available satellites, but has not collected enough data to calculate a 2D fix.

2D Nav (2D Navigation)—

at least three satellites with good geometry have been locked onto and a 2-dimensional position fix (latitude and longitude) is being calculated. ‘2D Diff’ will appear when you are receiving DGPS corrections in 2D mode.

3D Nav (3D Navigation)—

at least four satellites with good geometry have been locked onto, and your position is now being calculated in latitude, longitude and altitude. ‘3D Diff’ will appear when you are receiving DGPS corrections in 3D mode.

Poor Cvg (Poor GPS Coverage)—

the receiver isn’t tracking enough satellites for a 2D or 3D fix due to bad satellite geometry.

Not Usable—

the receiver is unusable, possibly due to incorrect initialization or abnormal satellite conditions. Turn the unit off and back on to reset, and reinitialize the receiver if necessary.

Simulator—

the receiver is in simulator mode.

EZinit Option Prompt

The Satellite Page also provides access to the EZ

init

prompt whenever a position fix has not been calculated. (The unit must be in searching, AutoLocate, acquiring, simulator, or poor coverage mode.) This allows you to reinitialize the unit (see Appendix A), and is useful if you have traveled over 500 miles with the receiver off and must initialize your new position. (The EZ

init

prompt will automatically appear if the receiver needs to be initialized. The prompt may also appear during normal use if the antenna is shaded or the unit is indoors.

REFERENCE

Receiver Status

& EZinit

The signal strength bars at the bottom of the page will not appear until the GPS 12XL has found the satellites indicated at the bottom of the screen.

If you travel more than 500 miles with the receiver off, reinitialize the unit to your new position by using the EZinit feature. To access EZinit, press ENTER from the Satellite Page before any satellites are acquired.

REFERENCE

Battery Level,

Backlighting &

Emergency Erase

When backlighting is on, a bulb icon will appear on the Satellite Page.

Use the icon to determine if backlighting is turned on during daylight hours.

Battery Level Indicator

The Satellite Page also features a battery level indicator, located to the left of the sky view, which displays the strength of the unit’s batteries. The battery indicator will not appear if the receiver is using external power.

The battery level indicator is calibrated for

alkaline batteries. Voltage differences will dis-

play Ni-Cad and lithium batteries differently . No other receiver functions are affected.

The GPS 12XL features an internal lithium battery that will maintain the unit’s memory when the receiver is not running off batteries or external power.

Backlighting Bulb Icon

The GPS 12XL features full-screen backlighting. Activate the backlight by pressing the Note: A bulb icon will appear on the Satellite Page when backlighting is turned on.

key briefly.

Emergency Erase Function

You may erase the GPS 12XL’s memory in four quick steps. This will cause all stored data to be deleted, including: routes, waypoints, and the track log.

To erase all stored data:

Upon activating the Emergency Erase Function, you will be asked to confirm your decision.

1. Ensure that the GPS 12XL is turned off.

2. While holding down the Mkey, hold down the key to turn the unit on. A warning message will appear with “Yes?” highlighted, and ask you to confirm your selection.

3. If you do not wish to erase all stored data, press

and Eto cancel the emergency erase.

4. If you do wish to complete the emergency erase, press

to confirm.

Position Page

The second page in the GPS 12XL’s primary page sequence is the Position Page. This page shows you where you are, what direction you’re heading, and how fast you’re going, and it’s most useful when you are traveling without an active destination waypoint. The graphic heading display at the top of the page indicates the direction you’re heading (while you’re moving).

Directly below this display are the track, speed, and trip odometer fields (default). Track is the compass direction representing your course over the ground, and speed is how fast you’re moving. The lower lefthand corner of the page shows your current latitude and longitude in degrees and minutes. The GPS 12XL uses this basic information to mark exact positions as waypoints, which help guide you from one place to another. The lower right-hand corner of the page contains the altitude field (default). Below that field is a 12- or 24-hour clock.

Both the trip odometer and the altitude fields are user selectable, and both offer a trip odometer, trip timer, and elapsed time. This way, you can always be sure of viewing this information regardless of the option you’ve selected to view in the other user-selectable field.

The following user-selectable options are available on the Position Page:

Trip Odometer (TRIP)—

total distance

traveled since last reset.

Trip Timer (TTIME)—

total (cumulative) time in which a ground speed has been maintained since last reset.

Elapsed Time (ELPSD)—

hours and

minutes since last reset.

Average Speed (AVSPD)—

average speed

traveled.

Maximum Speed (MXSPD)—

maximum

speed traveled since last reset.

Altitude (ALT)—

vertical distance above

sea level.

REFERENCE

Position Page

The speed and track displayed on the Position Page may fluctuate at slow speeds (or when you’re standing still) because of position errors caused by Selective Availability.

The user selectable fields on the Position Page give you a variety of information to choose from.

REFERENCE

Maximum Speed

& Altitude

Fields

Resetting the trip odometer will erase the previous mileage and set the odometer to 0.

To reset timer, speed measurement, or odometer:

1. Highlight the user-selectable field, and press E.

2. Press

to confirm or Qto exit.

The trip odometer, trip timer, and average speed fields are linked. Resetting one of these options in a user-selectable field will automatically reset the corresponding data in the other. This ensures that information shown in these fields reflects your current trip.

Maximum Speed Field

To obtain the most accurate reading of average speed, keep in mind that due to the sensitivity of the GPS 12XL’s antenna, your maximum speed value may include the effects of rapid movement, such as swinging your arm while holding the unit.

To reset the maximum speed field:

1. Highlight the ‘MXSPD’ field, and press E.

2. Press

to confirm the ‘RESET?’ prompt .

Altitude Field

When the GPS 12XL is acquiring satellites or navigating in the 2D mode, the last known altitude is used to compute your position. You may also manually enter your altitude for greater accuracy. In cases where the GPS 12XL has 2D coverage, entering your approximate altitude will enable the receiver to determine a 3D fix.

To enter an altitude:

1. Highlight the ‘ALT’ field, and press E.

2. Enter a value, and press

You may enter a known altitude to assist the GPS 12XL in establishing a 3D fix.

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