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1GSD 21 Sonar Module
INTRODUCTION
Thank you for choosing the Garmin GSD 21. The GSD 21 is a CANet
TM
compatible, remote sounder module designed to include powerful
features found in other Garmin sounders, including Color Depth Control Gain (DCG
®
), Dynacolor
TM
, 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.
INTRODUCTION
Power/Data
Connector
LED Status Indicator
Transducer
Connector
Mounting Holes