Looking for a thru-hull transducer that will provide both CHIRP/ClearVu and traditional sonar with temperature, to your compatible Garmin Fishfinder then the GT21-TH should be considered because it will provide 500 watts of power for CHIRP/ClearVu using frequencies 260/455 and 600 watts of conventional penetrating power through operating frequencies of 50/200 KHz. The GT21-TH can be used on boats with a deadrise up to 25 degrees, and comes complete with fairing block, isolation plate, bushings, and mounting hardware. If you have aluminum or other metal boat the GT21-TH is constructed of stainless steel so you do not have to worry about corrosion between the hull and the transducer.
*Compatible with Garmin echoMap 4xdv, 5xdv,73dv,7xsv,94sv, GPSMAP 7x1xs, GPSMAP 820xs/840xs and 1020xs/1040xs, GPSMAP 7600xsv series and GSD25.
*Adapter Cable may be required depending on unit transducer is paired with.
*ClearVu CHIRP Frequency Range - 260kHz = 245-275 and 455kHz =445-465
Replaces Garmin Part # 010-12219-10
Product Accessories for Garmin GT21-TH Thru-Hull Transducer
PropSpeed FoulFree Transducer Foul-Release Coating
PropSpeed's FoulFree Transducer Coating Kit is the biggest advancement in transducer paint and coatings in the last 30 years. It will keep your thru-hull or transom mount transducer free of marine growth. This nontoxic formula has zero leaching of harmful chemicals into water unlike traditional anti-fouling bottom paints and is certified by Airmar.