Like underwater radar ... !  

Interphase Technologies is the leader in affordable scanning sonar and depth sounders for recreational boaters and light commercial marine operators.

For suspended targets such as fish, the forward horizontal scan in the Dual Scanning Sonars. For a view of the entire water column and bottom contour directly foward of the vessel, the forward vertical scan is most appropriate.

This view is most often used for navigational safety and bottom searching.

Read how the crew of the unique expedition support yacht "Spirit of Sydney" use Interphase to pick their way through dangerous Ice and Rocks in Antarctica.