Nobeltec Furuno DFF3D Sounder Module Download - PBG Module RequiredFuruno DFF3D Sounder Module Download PBG Module Required Map the seafloor of your fishing area in just a few passes. 50 depth points per second, your time has never been so valuable! Instead of spending hours gathering PBG recordings, you can now collect PBG recordings in just a few sweeps. By adding the optional DFF3D Module together with the PBG Module to your TZ Professional software, you can connect this Furuno Multi Beam Sonar to your computer