The GSD 20 is a remote, black-box sounder that transmits 500 watts at 50/200kHz. It’s designed specifically for use with the GPSMAP 2006 and GPSMAP 2010 series units (including color versions) 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 shallow and See-Thru technology for enhanced fish-finding capabilities.

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