Item #956060

Garmin GT21-TH Thru-Hull Transducer

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Garmin GT21-TH Thru-Hull Transducer

Item # 956060


Perfect for coastal and offshore fishermen who want traditional sonar and CHIRP ClearVu scanning sonar with a stainless steel stem, this thru-hull mount transducer consistently displays clear and crisp fish arches with superior target separation as well as clear definition of structure below the boat.

The CHIRP ClearVu element has a power rating of 500 W and operating frequencies of 260/455 kHz. The traditional sonar has a power rating of 600 W and operating frequencies of 50/200 kHz. It includes a built-in fast-response temperature sensor. For hull deadrises less than 25 degrees.

GT21-TH includes an 8-pin transducer with stainless steel stem, fairing block, isolation plate and bushings, mounting hardware and installation instructions. Follow the instructions carefully to avoid damaging your boat.


  • Frequency: Traditional 50/200; ClearVu CHIRP 260 kHz (245-275 kHz) and 455 kHz (445-465 kHz)
  • Power: Traditional 600W; ClearVu 500W
  • Beamwidth:
    • Traditional: 40°/10°
    • ClearVu: 2.0° x 51° @ 260 kHz and 1.4° x 29° @ 455 kHz
  • Maximum Depth:
    • Traditional: 1,500'
    • ClearVu: 1,000'
  • Cable Length: 30'
  • Depth/Speed/Temperature: Depth and Temperature
  • Number Of Pins: 8-pin
  • Supported Deadrise/Transom Angles: Up to 25° deadrise

Part Numbers for Garmin GT21-TH Thru-Hull Transducer


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