Furuno DFF3D Multi-Beam Sonar f/NavNet TZtouch TZtouch2 [DFF3D]DFF3D Multi Beam Sonar for NavNet TZtouch & TZtouch2 Turn your NavNet TZtouch or TZtouch2 MFD into a multi beam sonar that can see 120 degrees port to starboard, allowing you to see the depth and direction fish schools are moving, while displaying the seabed condition in real time. The DFF3D gives you real time 120 port starboard view of the water column and seabed in over 650 feet. The DFF3D allows you to explore fishing spots and find fish in deep