3D Sonar Visualizer™ F3D-S is a new product that works in conjunction with the FSV-25/25 MARK-2 to show fish and sonar information in 3 dimensions. It uses the hull unit of your existing sonar but then processes the information in a unique way to show fish, peaks and sea floor data in a 3 dimensional “real world” view. The seabed can be removed from the picture to leave just what you want to see... Fish. Clearly see the size and shape of midwater fish marks to assess the best way to fish them and, with careful and simple adjustment of the depth line control, remove the seabed echoes to visualize fish schools close to the seabed.