A fishfinder or depth sounder (SONAR) uses sound energy transmitted by a transducer to detect the bottom depth, bottom structure, fish and other underwater objects.
See the real world beneath your boat
CHIRP DownVision Sonar
CHIRP SideVision Sonar
CHIRP SideVision Sonar uses two transducer arrays to produce impressive sidescan imagery. Adjustable transducer arrays allow the angler to preset their transducer angle for either shallow or deep water applications.
ClearPulse Digital Sonar