Garmin GT51M-THP CHIRP/Side/DownVu Xdcr Pair New Condition 010-01966-11. Features of Garmin GT51M-THP CHIRP/Side/DownVu Xdcr Pair: Perfect for the coastal and offshore fisherman who want CHIRP traditional sonar CHIRP ClearVu and CHIRP SideVu scanning...