Garmin GT23M-THGarmin GT23M TH Perfect for coastal and offshore fishermen who want CHIRP traditional sonar and CHIRP ClearV 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 8 pin transducer features mid band CHIRP traditional sonar (80 160 kHz) and has a power rating of 600 W. The CHIRP ClearV (260