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Hello selling my used in great shape black box sounder. Askin $75 or best offer. I'm located in Pa. Unit worked great when removed from the boat. Cables included.

The GSD 20 is a remote, black-box sounder that transmits 500 watts at 50/200kHz. It’s designed to provide SONAR capabilities.
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.

Compatible 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, & GPSMAP 3010C
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