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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

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.

Power/Data

Connector

GSD 20 Sonar Module

NTRODUCTION

) and See-Thru

LED Status Indicator

technology. When used with compatible Garmin

Transducer

Connector

NTRODUCTION

Mounting Holes