Garmin GT15M-THF 20 Degree 600W SS Thru-Hull Transducer [010-02868-02]GT15M THF 20 Degree 600W SS Thru Hull Transducer Designed for reduced drag and optimum sonar performance on midsize fishing and cruising boats, this flush mounted, 600 watt mid band CHIRP transducer clearly defines fish arches, structure, and bottom depth returns on the display. Midband Chirp Traditional Sonar This 8 pin, 600 watt stainless steel thru hull transducer features high definition mid band CHIRP sonar that clearly defines fish targets and