Garmin Sounder GCV 10

The GCV 10 black box sonar adds both SideVü and DownVü with CHIRP scanning sonar technologies to your compatible Garmin echoMAP or GPSMAP series combo (see compatible devices). CHIRP technology sweeps through a range of frequencies to give you an ultra-clear sonar picture of objects, structure and fish that pass below (DownVü) and to the sides (SideVü) of the boat.