Garmin GT51M-TH CHIRP/Side/DownVu Xdcr - GA-0100196610Garmin GT51M-TH CHIRP/Side/DownVu Xdcr - GA-0100196610
GT51M-TH thru-hull mount transducer, MFG # 010-01966-10, CHIRP Traditional/CHIRP SideVu/ CHIRP DownVu optimized for depth performance and rough conditions.