The GSD 20 is a remote, black-box sounder that transmits 500 watts at 50/200kHz. It’s designed for use with the GPSMAP® 3006C, GPSMAP® 3010C, GPSMAP® 2006/2006C, GPSMAP 2010/2010C, GPSMAP 182/182C and GPSMAP 232 to provide SONAR capabilities to these units. 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.