Garmin GSD 21 User Manual

GSD 21
Sounder
Module

installation instructions

© Copyright 2006 Garmin Ltd. or its subsidiaries

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supplemental information concerning the use and operation of this and other Garmin products.

Garmin®, DCG®, CANet TM, UltrascrollTM, and DynacolorTM are trademarks and registered trademarks of Garmin Ltd. or its subsidiaries and may not be used without
the express permission of Garmin.

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Garmin Corporation
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m) for current updates and

Safety Information

WARNING: This product, its packaging, and its components contain chemicals known to the State of California to cause cancer, birth defects, or reproductive harm.
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February 2006 Part Number 190-00630-00 Rev. A Printed in Taiwan

INTRODUCTION

INTRODUCTION

Thank you for choosing the Garmin GSD 21. The GSD 21 is a CANetTM compatible, remote sounder module designed to include powerful
features found in other Garmin sounders, including Color Depth Control Gain (DCG

®

), DynacolorTM, and auto gain features technology. When
used with compatible Garmin chartplotters, it provides full-featured depth sounder functions. It can interface to multiple head units, providing
complete sounder control from multiple stations, including transmit frequency, range, and gain adjustments. To get successful results from your
GSD 21, take time to read through this installation guide. If any items are missing, please contact your Garmin dealer immediately.

Included Equipment:

• GSD 21 Sounder Module

• 6 ft (0.30 m) Power/Data Cable

• 40 ft (12.19 m) CANet/Serial Extension Cable

• 2 CANet Terminators

• 7 3-Wire Connectors

• The GSD 21 Sounder Module Installation Instructions

Optional Transducers

The transducer acts as the eyes and ears of your new sonar. 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.

Proper transducer selection and installation are critical to the operation of your unit. Since mounting locations vary, see your local dealer or
contact Garmin Product Support for further information. A full list of transducers can be found at www.garmin.com.

Mounting Holes

Transducer

Connector

LED Status Indicator

Power/Data

Connector

1GSD 21 Sonar Module

INSTALLATION INSTRUCTIONS

INSTALLATION INSTRUCTIONS

The GSD 21 must be properly installed according to the following CANet or Serial installation instructions to get the best possible
performance. To complete the installation, you need appropriate fasteners. If you experience difficulty with the installation, contact Garmin

Product Support.

CANet is a high-speed sonar network. If you are connecting a CANet compatible unit, follow the CANet installation instructions. Using the
CANet installation optimizes the performance of the CANet-compatible units. CANet compatible unit devices features, such as Ultrascroll

TM

,

are affected if a serial installation is used.

The module should be mounted in an out-of-the-way location that is dry and well ventilated. Avoid mounting the module where it can be
submerged in liquids or exposed to extreme temperatures. Be sure to mount the module so that the LED is visible.

NOTE: When using the chartplotter and GSD 21 on battery power only (engines off) for extended periods of time, be sure there is enough

available amperage to run the units for the time period. Running other onboard devices at the same time can lower the available amperage, causing
the chartplotter and/or GSD 21 to shut off. Check with your local marine dealer/installer if problems persist.

To install the GSD 21 sounder module:

1. After the location is chosen, place the unit. Be sure to allow enough clearance for attaching the cables. Using the module as a template,
mark the location of the four mounting holes. If needed, additional mounting holes can be drilled in the side mounting flanges of the
module.

2. Attach the GSD 21 to the mounting location using appropriate fasteners.

3. Mount the transducer according to the instructions provided with the transducer.

4. Route the cables according to the CANet or Serial instructions to the mounting locations of the display unit. Use the appropriate
tie-wraps, fasteners, and sealant to secure the cable along the route and through any bulkhead or deck.

5. After installing the GSD 21 module, connect the power/data and transducer cables to the appropriate receptacle.

6. Refer to the following CANet and serial wiring diagrams for connecting the GSD 21 to compatible Garmin units.

NOTE: You can extend the CANet wiring of the GSD 21 power/data cable up to 80 ft (24.38 m) total length using the CANet Connections Kit.

NOTE: You can extend the serial/power wiring of the GSD 21 power/data cable up to 100 ft (30 m) total length. Use the CANet Extension Cable

or 22 AWG, 4-conductor shielded cable for data connections and 18 AWG for power. Transducer cable extensions are available through your
Garmin dealer.

WARNING: Do not connect or disconnect the transducer while the MFD and GSD 21 are connected and turned on . Doing so might damage the

GSD 21.

2 GSD 21 Sonar Module

INSTALLATION INSTRUCTIONS

�

GARMIN GSD 21

SOUNDER MODULE

BLACK

ORANGE

GREEN

WHITE

CANet

Terminator

CANet

Terminator

CANet

Extension Cable

RED

BLACK

FUSE

2A

TO

TRANSDUCER

BLACK

DRAIN

ORANGE

GREEN

WHITE

BATTERY

10-35 VOLTS DC

See the CANet Terminator

Connection Diagram Below

Green

White

Green

3 wire connector

3 wire connector

Green

White

White

To Chartplotter

Unit

CANet

Unit

CANet

Terminators.

CANet Wiring for the Garmin GSD 21

Multiple CANet Unit Connection

1 ft to 80 ft and a CANet compatible device can be

The CANet Extension Cable can be cut to any length

inserted on the cable at any point between the two CANet

Unit

CANet

CANet CANet

CANet Terminator

CANet Terminator Connection

CANet Connections Kit.

2. The CANet Extension Cable can support a maximum of two display units and one sonar unit.

3. The maximum length of cable from the CANet Extension Cable to the sonar or display units is 6 ft.

1. Power and ground wires require 18 AWG. You can extend the CANet wiring of the GSD 21 power/data cable up to 80 ft (24.38 m) total length using the

4. Refer to the chartplotter’s installation instructions for wiring the GPS 17 sensor and other devices.

to their color.

5. Ground the drain wire at the first display unit. Do not ground the drain wire on the subsequent display units or sonar unit.

6. The CANet Extension Cable Black wire is reserved for future use. When inserting a CANet unit on the CANet Extension Cable, reconnect all wires according

7. When crimping the 3-wire connector, use a standard pair of pliers and make sure the button is fully depressed into the connector.

Notes:

3GSD 21 Sonar Module