•  Marine Safety
•  Marine Electronics and Navigation
  •  ANTENNAS
  •  AUTOMATIC IDENTIFICATION SYSTEMS
  •  AUTOPILOTS
  •  BINOCULARS AND OPTICS
  •  CARTOGRAPHY
  •  COMPASS
  •  FISHFINDERS
  •  FRS-GMRS RADIOS
  •  FUEL FLOW METERS
  •  GPS FISHFINDER COMBO
  •  GPS FIXED MOUNT
  •  GPS HANDHELD
  •  GPS HH ACCESSORIES
  •  GPS PDA
  •  GPS PLOTTERS
  •  MEMORY CARDS
  •  MOUNTING HARDWARE
  •  MULTIFUNCTION DISPLAYS
  •  NAVIGATION INSTRUMENTS
  •  PARTS
  •  RADAR - ARRAY
  •  RADAR - DOME
  •  SATELLITE RECEIVER
  •  TIME - TIDE - BAROMETER
  •  TRANSDUCERS
  •  MARINE VHF RADIO ACCESSORIES
  •  MARINE VHF RADIO FIX MOUNTED
  •  MARINE VHF RADIO HANDHELD
  •  WEATHER INSTRUMENTS
  •  CB RADIO
  •  UNDERWATER CAMERAS
  •  EXTENDED WARRANTIES
•  Marine DVD
•  Marine Hardware AND Electrical
•  Sport-Misc
•  Boat Engines and Parts
•  Boat Maintenance and Repair
•  Trailer Accessories
•  Marine Clothing

Home > Marine Electronics and Navigation > FISHFINDERS > Garmin GSD 21 "Black Box" Remote Sounder Module

Add depth to your chartplotter view with the GSD 20 series remote sounders. The GSD 21, a powerful analog sonar, along with the GSD 22, Garmin's first digital sonar, are robust units designed to operate with stand-alone chartplotters or integrate with the Garmin CANet and Marine Networks.

The GSD 21 is a black-box sounder that provides fast Ultrascroll displays and 500-watt (RMS) sounder capability to 2000 series and 292/392/492 series chartplotters featuring the Garmin CANet bus. The GSD 21 will work with a serial connection to other Garmin plotters without the CANet connection, but will not offer Ultrascroll capability. The units all-new, high-dynamic range analog sonar receiver provides exceptional performance in water as shallow as one foot on down to depths of 1,500 feet. It connects to a dual frequency transducer (50/200 kHz) for deep-water performance or a single frequency, dual beam width transducer (narrow/wide) for operation in shallow freshwater as well as deeper water. Provides 500 W transmit power with dual frequency transducer or 400 W with dual beam width transducer.

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

GSD-21 IS COMPATIBLE WITH THE FOLLOWING UNITS:

• 292


• 392
  
• 492
  
• 2100 SERIES
  
• 2200 SERIES