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…Continue readingGarmin GT15M-THF 20 Degree 600W SS Thru-Hull Transducer [010-02868-02]