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1GSD 20 Sonar Module
INTRODUCTION
Thank you for choosing the Garmin GSD 20. The GSD 20 is an intelligent, remote sounder module designed to include powerful features
as found in other Garmin sounders, including Depth Control Gain (DCG
®
) and See-Thru
®
technology. When used with compatible Garmin
chartplotters, it provides full-featured depth sounder functions. It may interface to multiple head units, providing for complete sounder control
from multiple stations, including transmit frequency, range, and gain adjustments. To get successful results from your GSD 20, take time to read
through this installation guide. If any items are missing, please contact your Garmin dealer immediately.
Included Equipment:
• GSD 20 Sounder Module
• 30’ (9.1 m) Power/Data Cable
• Installation Guide for the GSD 20
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