Garmin Fishfinder 320C User Manual

Fishfi nder 320C

owner’s
manual
and
reference
guide

© Copyright 2003 Garmin Ltd. or its subsidiaries

Garmin International, Inc.
1200 East 151st Street, Olathe, KS 66062, U.S.A.
Tel. [phone] or 800/800.1020 Fax [phone]

Garmin (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey SO51 9DL, U.K.
Tel. [phone] Fax [phone]

Garmin Corporation
No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan
Tel. [phone] Fax [phone]

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

March 2003 Part Number 190-00261-00 Rev. A Printed in Taiwan

Preface

Thank you for choosing the Garmin Fishfi nder 320C. This product is designed for easy operation and to

provide years of reliable service.

Please take the time to read this Owner’s Manual, and learn the operation of your new unit. This will

help ensure that you get the most from the Fishfi nder 320C. This manual is broken down into three sections

for your convenience. Section One covers the installation and testing for the
provides detailed references to the features and operations of the
overview of how sonar works and provides information on interpreting the sonar graph.

Product Support

If you encounter a problem, or just have a question, our Product Support Department can be reached

Monday-Friday 8am to 5pm Central Standard Time.

By phone at— 1-800-800-1020 or [phone]

Online at— http://www.garmin.com/contactUs/techSupport.jsp

Check the Garmin Web Site (www.garmin.com) for links to Product Support and Product FAQ’s

Enjoy your new Fishfi nder 320C and once again thank you for choosing Garmin.

Product Registration

Help us better support you by completing our on-line registration today! Have the serial number
of your Fishfi nder 320C Sounder 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 ii of this manual.

Fishfi nder 320C. Section Three gives a basic

Fishfi nder 320C. Section Two

Introduction

Preface and

Registration

NOTE: If you have previously registered a Garmin product purchase, we invite you to re-reg-

)

ister 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.

i

Introduction

Warranty and

Serial Number

Serial Number

Use this area to record the serial number (8-digit number
located on the bottom 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 Fishfi nder 320C 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
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.

of the package. The unit

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.

ii

Phone: [phone] Phone: [phone]
FAX: [phone] FAX: [phone]

Software License Agreement

BY USING THE FISHFINDER 320C, 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 of 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.

,

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.

Introduction

Software License Agreement

iii

Introduction

Packing List

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

following items. The package part number can be found on the outside of the box. If any parts are miss-

ing, please contact your Garmin dealer immediately.

Standard Package (010-00289-00 w/o transducer):

• Fishfi nder 320C Unit • Surface-Mount Bracket and Knobs • Power/Data Cable • Owner’s Manual

• Self-Adhesive Quick Reference Guide • Protective Cover • Flush-Mount Hardware Kit

Optional Package (010-00289-01) includes Standard Package, plus:

• Dual Frequency (200/50kHz, 10/40°) Plastic Transom Mount Transducer with Depth and Temp

• Separate Speed Sensor

)

For the most recent list of available accessories for your

unit, current user manuals and software updates, visit our

web site at www.garmin.com.

iv

Optional Package (010-00289-02) includes Standard Package, plus:

• Single Frequency (200kHz, 20°) Plastic Transom Mount Transducer with Depth and Temp

• Separate Speed Sensor

Optional Accessories:

• US A/C PC Adapter • EURO A/C PC Adapter • Cigarette Lighter Adapter • 2nd Mounting Station

• 10 ft. Transducer Extension cable • 20 ft. Transducer Extension cable • Temperature probe

• Speed sensor • Temp & Speed only sensor, plastic, thru-hull mount

Optional Transducers:

Included in the Optional Packages are transom mount transducers and separate speed sensors. These

transducers provides good all-around performance. For a list of optional transducers, see page v.

Transducers

The transducer acts as the eyes and ears of your new sonar. Proper transducer selection and installation
are important to the operation of your unit. The transducer transmits sound waves toward the bottom in a
cone shape. The larger the cone angle the larger the coverage area at a given depth. While it is good to see as
large of an area as possible, it is best to select a transducer that suits the water that you are on.

A wide cone angle transducer works best in shallower water. The wide cone angle provides a large cov­erage or viewing area, but at a decreased bottom resolution. In deeper water this can result in a large dead
zone where fish cannot be seen.

A narrow cone angle transducer is better suited to deep water installations. The narrow cone angle pro­vides a smaller coverage or viewing area (compared to a wide cone angle transducer at the same depth) with
improved bottom resolution and a smaller dead zone.

A variety of optional transducers are available from your local dealer or direct from Garmin.

• 200/50kHz, 12/45°, plastic, transom mount, depth, temp

• 200/50kHz, 12/45°, plastic, transom mount, depth, temp, speed

• 200/50kHz, 12/45°, bronze, thru-hull mount, depth

• 200/50kHz, 12/45°, bronze, thru-hull mount, depth, temp, speed

• 200/50kHz, 12/45°, bronze, thru-hull mount/long stem, depth, temp, speed

• 200/50kHz, 12/45°, plastic, thru-hull mount, depth

• 200/50kHz, 12/45°, plastic, adjustable. in-hull mount

• 200kHz, 14°, plastic, transom mount, depth

• 200kHz, 14°, plastic, transom mount, depth, temp

• 200kHz, 14°, plastic, transom mount, depth, temp, speed

• 200kHz, 8°, plastic, transom mount, depth, temp

• 200kHz, 8°, plastic, transom mount, depth, temp, speed

• 200kHz, 12°, bronze, thru-hull mount, depth

• 200kHz, 12°, bronze, thru-hull mount, depth, temp

• 200kHz, 9°, bronze, thru-hull mount, depth, temp, speed

• 200kHz, 12°, plastic, thru-hull mount, depth

• 200kHz, 12°, plastic, thru-hull mount, depth, temp

• 200kHz, 14°, plastic, in-hull mount, depth

• 200kHz, 14°, plastic, trolling motor mount, depth, temp

Introduction

Selecting a Transducer

Wide cone angle

Narrow cone angle

dead zone

fish not seen

X

X

v

Introduction

Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . i-vi

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

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ii

Software License Agreement . . . . . . . . . . . . . . iii

Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . iv

Selecting a Transducer . . . . . . . . . . . . . . . . . . . v

Table of Contents . . . . . . . . . . . . . . . . . . . . . . vi

Section One: Installation . . . . . . . . . . . . . . . . . 1-7

Unit Installation . . . . . . . . . . . . . . . . . . . . . . . .1

Wiring and Interfacing . . . . . . . . . . . . . . . . . . .3

Mounting the Transducer . . . . . . . . . . . . . . . . .5

Testing the Installation . . . . . . . . . . . . . . . . . . .7

Section Two: Unit Operation . . . . . . . . . . . . . 8-20

Keypad Usage . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Sonar Page . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Using the Adjustment Menu . . . . . . . . . . . . . . 10

Adjustment Menu Options . . . . . . . . . . . . . . .10

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Zoom . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

View/Span . . . . . . . . . . . . . . . . . . . . . . . . 11

Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Target Level . . . . . . . . . . . . . . . . . . . . . . . 11

Whiteline . . . . . . . . . . . . . . . . . . . . . . . . .12

Frequency . . . . . . . . . . . . . . . . . . . . . . . . .12

vi

Depth Line . . . . . . . . . . . . . . . . . . . . . . . .12

Noise Reject . . . . . . . . . . . . . . . . . . . . . . .12

Scroll . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Size Split . . . . . . . . . . . . . . . . . . . . . . . . . .12

Using the PAUSE Key . . . . . . . . . . . . . . . . . .13

Using the DATA Key . . . . . . . . . . . . . . . . . . .14

Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Graph Tab . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Fish Symbols . . . . . . . . . . . . . . . . . . . . . .15

Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Custom Range . . . . . . . . . . . . . . . . . . . . . 16

Background Color . . . . . . . . . . . . . . . . . .16

Number Size . . . . . . . . . . . . . . . . . . . . . . .16

Temperature and Water Speed . . . . . . . . .16

Tools Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Flasher . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Color Bar . . . . . . . . . . . . . . . . . . . . . . . . . 16

Temperature Graph . . . . . . . . . . . . . . . . .16

Temp Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Temperature Scale . . . . . . . . . . . . . . . . . .16

Time Duration . . . . . . . . . . . . . . . . . . . . .16

Reset Auto Scale . . . . . . . . . . . . . . . . . . . .16

Alarms Tab . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Fish Alarm . . . . . . . . . . . . . . . . . . . . . . . .17

Shallow/Deep Water Alarms . . . . . . . . . . .17

Drift Alarm . . . . . . . . . . . . . . . . . . . . . . . .17

Water Temperature Alarm . . . . . . . . . . . . .17

Battery Alarm . . . . . . . . . . . . . . . . . . . . . .17

Timer Alarm . . . . . . . . . . . . . . . . . . . . . . .17

System Tab . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Beeper . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Language . . . . . . . . . . . . . . . . . . . . . . . . .18

Simulator . . . . . . . . . . . . . . . . . . . . . . . . .18

NMEA Input/Output . . . . . . . . . . . . . . . .18

Factory Settings . . . . . . . . . . . . . . . . . . . .18

Software Version . . . . . . . . . . . . . . . . . . . .18

Reset Odometer . . . . . . . . . . . . . . . . . . . . 18

Units Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Temperature . . . . . . . . . . . . . . . . . . . . . . .18

Distance and Speed . . . . . . . . . . . . . . . . .18

Position Format . . . . . . . . . . . . . . . . . . . .18

Heading . . . . . . . . . . . . . . . . . . . . . . . . . .19

Sonar Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Water Type . . . . . . . . . . . . . . . . . . . . . . . .19

Depth Number . . . . . . . . . . . . . . . . . . . . . 19

Automatic Scroll Speed Limit . . . . . . . . . .19

Keel Offset . . . . . . . . . . . . . . . . . . . . . . . . 19

Transducer Type . . . . . . . . . . . . . . . . . . . .19

Calibrate Water Speed . . . . . . . . . . . . . . .19

Time Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Time Format . . . . . . . . . . . . . . . . . . . . . . . 20

Time Zone . . . . . . . . . . . . . . . . . . . . . . . .20

Daylight Saving Time . . . . . . . . . . . . . . . . 20

Current Time and Date . . . . . . . . . . . . . . .20

Section Three: On the Water . . . . . . . . . . . . 21-24

Understanding Sonar . . . . . . . . . . . . . . . . . . .21

Transducer Coverage . . . . . . . . . . . . . . . . . . .22

Understanding the Graph . . . . . . . . . . . . . . . .23

Whiteline and Thermoclines . . . . . . . . . . . . . 24

Appendices . . . . . . . . . . . . . . . . . . . . . . . . . 25-28

Appendix A: Specifi cations and Cleaning . . . .25

Appendix B: Messages and Alarms . . . . . . . . .26

Appendix C: Index . . . . . . . . . . . . . . . . . . . . . 27

Installing the Fishfi nder 320C

The Fishfi nder 320C must be properly installed according to the following instructions to get the best
possible performance. To complete the installation, you’ll need the appropriate fasteners and tools. Check
that all cables will reach the unit mounting location and also take time to read through these instructions
prior to installation. Be sure to always wear safety goggles and a dust mask when drilling, cutting or sand­ing. When in doubt, seek professional assistance.

Surface Mounting the Fishfi nder 320C Unit

The Fishfi nder 320C’s compact, waterproof case is suitable for mounting in exposed locations or at the
nav station. The unit comes with a surface-mount bracket that can be used for console or overhead mount­ing. When choosing a location for the display unit, make sure you consider the following conditions:

• There should be at least a 3” (8 cm) clearance behind the case to allow connection of the transducer
and power/data cables.

• The mounting surface should be heavy enough to support the unit and protect it from excessive
vibration and shock.

NOTE: The temperature range for the Fishfi nder 320C is 5°F to 158°F (-15°C to 70°C).

,

Extended exposure to temperatures exceeding this range (in storage or operating condi­tions) may cause failure of the LCD screen. This type of failure and related consequences are
NOT covered by the manufacturer’s limited warranty.

To surface mount the Fishfi nder 320C display:

1. Place the mounting bracket in the desired location.

2. Mark and drill the four mounting holes for the fastener you are using.

3. Fasten the bracket to the surface using the appropriate fasteners.

4. Insert the Fishfi nder 320C into the mounting bracket. The bracket is designed for a tight fi t to provide
additional support when swiveling the unit.

5. Screw the two mounting knobs through the bracket and into the display case.

6. Connect the power/data and transducer cables to the back of the unit, making sure the locking rings are
fully tightened on both connectors.

Installation

Unit Installation

OK

The Mounting Bracket is designed to be secured using a
fl at head screw. If you use a screw with a countersunk
head, you risk damaging the Mounting Bracket.

1

Installation

Unit Installation

WasherHex Nuts

Studs

Flush Mounting the Fishfi nder 320C Unit

The Fishfi nder 320C can be fl ush mounted on a fl at panel. When fl ush mounting the Fishfi nder 320C,
be sure to choose an appropriately sized location for the unit. Check that all cables will reach the unit
mounting location before beginning installation. Use the Flush Mount Template provided in the box to
determine a location. Be sure to always wear safety goggles and a dust mask when drilling, cutting or sand­ing. Included Mounting Hardware: 4 - 3mm Studs, 4 - Flat Washers, 8 - 3mm Hex Nuts

To fl ush mount the Fishfi nder 320C:

1. Trim the Flush Mount Template and tape in the desired location.

2. Using a Center Punch, indent the center of each Mounting Hole location.

3. Using an 1/8” (3mm) drill bit, drill the four Mounting Holes.

4. Using a 3/8” (6mm) drill bit, drill a hole for a location to begin cutting the mounting surface.

5. Using the Jig Saw, cut the mounting surface along the inside of the dashed line indicated on the
template. Be very careful when cutting this hole, there is only a small amount of clearance
between the unit and the Mounting Holes. It may be prudent to cut slightly inside the indicated
line and then sand or fi le the panel as needed to obtain the best fi t.

6. Install the four Mounting Studs into unit by screwing the shorter section in to the back of the unit. Use a
1/16” (2mm) Allen Wrench to tighten the Mounting Studs until the stop contacts the case. Be careful not
to overtighten as this may damage the Mounting Stud! The studs have a reusable thread-locking patch
pre-applied from the factory.

7. Place the unit in position in the cut out in the mounting surface.

8. Place washers over the Mounting Studs, then thread on one Hex Nut per Mounting Stud. Tighten all four
until the unit is snug against the mounting surface. Install and tighten the second Hex Nut on all four
Mounting Studs to lock the fi rst one in place.

2

Connecting the Power/Data Cable

The power/data cable connects the Fishfi nder 320C to a 10-35 volt DC system and provides interface
capabilities for connecting external devices. The color code in the diagram (pg. 4) indicates the appropriate
harness connections. Replacement fuse is a AGC/3AG - 2 Amp fuse. If it is necessary to extend the power/
data wires, use a wire of comparable size and keep your extension as short as possible.

If your boat has an electrical system, it may be possible to wire the unit directly to an unused holder on
your current fuse block. If you are using the boat’s fuse block, remove the in-line fuse holder supplied with
the unit. If your boat does not have a fuse block, the unit can be wired directly to the battery. Make sure the
2-Amp in-line fuse supplied with the unit is installed if connecting the unit direct to the battery.

Installing the Wiring Harness (Basic):

1. Determine the polarity of the fuse holder using a Test Light or Volt Meter.

2. Install the Red (+) wire on the Positive Fuse Holder Terminal.

3. Install the Black (-) wire on the Negative Fuse Holder Terminal.

4. Install a 2 amp fuse in the Fuse Holder.

Install 2-Amp

Fuse

The Fishfi nder 320C can be connected to another piece of NMEA compatible electronic equipment,
such as a Garmin GPS (Global Positioning System). If equipped with a capable transducer, the Fishfi nder
320C can send depth, temperature, and speed information. It can also mark a location (pg. 13) that could
be displayed on another device and can accept GPS navigational data (pg. 14), such as position, time,
course, distance, etc. Refer to the wiring diagram on the following page for interfacing the Fishfi nder 320C
with other devices.

Installing the Wiring Harness to a GPS:

1. Follow steps 1-4 of the above wiring harness installation. For Garmin units, the Ground (black) wires
from both devices must be attached together or on the same fuse terminal for data ground. Refer to the
wiring diagram of your GPS unit for wire identifi cation.

2. Connect the Blue (Data Out) wire from the Fishfi nder to the Data IN wire on the GPS harness.

3. Connect the Brown (Data In) wire from the Fishfi nder to the Data OUT wire on the GPS harness.

4. Set the Fishfi nder 320C NMEA Input/Output to ‘On’ (pg. 18). For Garmin GPS units, set the
communications interface to NMEA/NMEA, NMEA In/NMEA Out or NMEA.

Boat Ground

Installation

Wiring and Interfacing

To 10-35 Volt Boat Supply

+

2A

-

Black Wire

To Fishfi nder 320C

Red Wire

3

Installation

Wiring and Interfacing

You can download a copy of Garmin's propri­etary communication protocol document from

the Help and Support section of our web site at

www.garmin.com.

PIN 1 (red) 10-35 VDC

PIN 2 (black) Ground (Power and Data)

(Cable View)

4

3

5

2

6

1

7

PIN 3 (blue) Port 1 Data OUT

PIN 4 (brown) Port 1 Data IN

PIN 5 (white) Port 2 Data IN (N/C)

PIN 6 (green) Port 2 Data OUT

PIN 7 (yellow) Alarm Low

Note: During a typical installation, only the Red and
Black wires are used. The other wires do not have to
be connected for normal operation of the unit.

Alarm Relay
100ma max

coil current

Power

10-35 volts DC

RXD +

GPS/NMEA

Device

TXD +

and RXD -

NMEA Device

RXD +

Complete information concern-

ing National Marine Electronics

Association (NMEA) format and

sentences is available for purchase

from NMEA at:

NMEA

Seven Riggs Avenue

Severna Park, MD 21146

U.S.A.

410-975-9425

410-975-9450 FAX

www.nmea.org

Interfacing

The Fishfi nder 320C allows for NMEA 0183, Version 2.3 input/output with a compatible GPS or
navigation device. NMEA Input/Output must be set to ‘On’ to send/receive data. (see pg. 18). For additional
information on using your Fishfi nder 320C with NMEA devices, see pages 3, 13-14, and 18.

The following are the sentences for NMEA 0183, version 2.3:

Input — GPBOD, GPBWC (only used if RMB not present), GPGGA, GPGLL (only used if GGA not present),
GPRMB, GPRMC, GPXTE (only used if RMB not present)

Output — SDDBT, SDDPT, SDMTW, SDVHW, SDWPL* (only if a waypoint is “marked” in Pointer Mode)

*Garmin GPS units will accept the SDWPL (WPL) NMEA sentence and create a waypoint (saved location) at that position (see pg.

13). For compatibility with other brands of GPS or NMEA capable navigation devices, check with that manufacturer to see if their unit

4

accepts/stores NMEA 0183 SDWPL sentences/waypoints. The Fishfi nder 320C does not store the actual waypoint. Only the receiving
device, if capable, will store the waypoint.