Furuno’s DFF3 is a new network sounder featuring FDF (Furuno Digital Filter) signal processing technology. The DFF3 is designed for use with NavNet, NavNet VX2 and NavNet 3D. This new digital Network Sounder can turn any NavNet display into a powerful, dual-frequency digital fish finder. The compact network sounder unit connects directly to a NavNet display or an Ethernet hub with a single Ethernet cable.