garmin, garmin marine, gpsmap, gps, sonar, radar, autopilot, fishfinder

Perfect for coastal and offshore fishermen who want traditional sonar and CHIRP ClearVü scanning sonar. This transom mount transducer consistently displays clear and crisp fish arches with superior target separation as well as clear definition of structure below the boat.

GT21-TM includes an 8-pin transducer with mounting hardware and installation instructions. Follow the instructions carefully to avoid damaging your boat.

Traditional Sonar: 600W , 1500ft maximum depth

CHIRP Sonar: 500W, 1000ft maximum depth

Integrated Temperature sensor