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This product has been discontinued. We are happy to help you, and we will continue to support this product. Click on the left-hand sidemenu links or visit our support web pages for further assistance.

The GSD 20 is a remote, black-box sounder that transmits 500 watts at 50/200kHz. It’s designed to provide SONAR capabilities to the following units: GPSMAP® 172, GPSMAP 172C, GPSMAP 182/182C, GPSMAP 192, GPSMAP 232, GPSMAP 276C, GPSMAP 296, GPSMAP 376C, GPSMAP 396, GPSMAP 2006/2006C, GPSMAP 2010/2010C, GPSMAP 3005C, GPSMAP 3006C, and GPSMAP 3010C. The sounder module sends data serially in a Garmin® proprietary format to up to two units on board. When viewed on Garmin chartplotters, you’ll see full-featured sounder displays in either split- or full-screen presentations. Features include auto-ranging, 2X and 4X auto and manual zoom, optional fish symbols and See-Thru® technology, which separates fish from thermoclines and structure.

Please Note: This product does not include a transducer. Garmin offers a complete selection of transducers to be purchased separately as accessories.

Screens from the GPSMAP 2010C equipped with a GSD 20

	See-Thru technology allows you to see fish, even in thermoclines.	View bottom information and navigation data at the same time.	The GSD 20's bottom lock feature allows you to view a section of the water column within a specified depth of the bottom, such as 10 feet.
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