| Brand | Garmin |
|---|---|
| Manufacturer Part Number | GSD 60 |
Check the listing for details. Garmin GSD 20 Sounder Module. Condition: Used. Listed at 71.24 USD. Garmin GSD 20 Remote Sonar Sensor, a "black box" sounder module designed to integrate with compatible Garmin marine chartplotters. Function: Provides full-featured depth sounder functions, including 500 watts of power at 50/200 kHz.