Garmin GSD 20 011-00792-00 Black Box Sonar Sounder FishFinder Module for Garmin Chartplotters

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  • Regular price $89.95
  • 1 available


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, GPSMAP 3010C and more. 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.

  • Garmin GSD 20 Black Box Sonar Sounder Module for Garmin Chartplotters 
  • Great for dual-helm boats; allows you to view and control sonar on one or two chartplotters
  • External mounting to allow shorter transducer cable length on large boats
  • 4,000 watts transmit power peak-to-peak (500 watts RMS) 1,500 foot max depth*
  • Dual frequency 50/200 kHz (40/10) for shallow or deep-water performance
  • Display options — auto ranging, 2X and 4X auto and manual zoom, 3 fish symbol sizes, adjustment bar
  • Alarms — deep water, shallow water, 3 size fish, low battery
  • Transducer auto sense — automatically displays speed and temperature data without menus
  • See-Thru technology — shows weak/strong returns simultaneously
  • Depth Control Gain (DCG) — automatically adjusts fishfinder sensitivity according to depth
  • Size: just 4.75" W x 6.75" L x 2" H
  • Waterproof to IPX-7 standards
  • Easy installation
  • Numerous transducer options including transom, plastic or bronze thru-hull, speed and temperature sensor
  • Manufacturer: Garmin
  • Model Number: GSD20, GS-D20
  • Part Number: 011-00792-00
  • Condition: In Stock, Ready to Ship! This unit is in very good physical condition and was removed from a boat that received a total electronics refit. See Photos. Guaranteed in good working order and covered by a 14 day return policy. This listing is only for what is shown in the photos. No other parts or pieces are included.