Furuno DFF3D Multi-Beam Sonar f/NavNet TZtouch & TZtouch2

The Furuno DFF3D is a multi-beam sonar black box for NavNet TZtouch systems that need a wider view beneath and beside the boat. Its 165kHz transducer system covers a 120-degree side-to-side angle and supports Cross Section, 3D Sounder History, Triple Beam, and Side Scan modes. This is an external sonar module, so a compatible Furuno display and transducer are required.

The direct-down detection figure is listed at 650 feet, while side detection can reach beyond 1000 feet under the supplied specification. The different modes matter in practice: Cross Section helps inspect the water column, 3D History builds a picture of the bottom, and Side Scan extends the search area away from the hull. Ethernet links the DFF3D to NavNet TZtouch, TZtouch2, TZtouch3, or TZtouchXL systems.

Key Features

- 165kHz multi-beam sonar – Provides a broad underwater view across the 120-degree scanning angle.
- Cross Section mode – Helps examine targets and the water column across the beam.
- 3D Sounder History – Builds a three-dimensional view of previously scanned bottom.
- Triple Beam and Side Scan – Provides additional coverage around and beneath the boat.
- Ethernet networking – Connects the module to compatible NavNet displays.

Who Is This For?

This Furuno multi-beam sonar suits offshore fishing boats, cruisers, and NavNet users who want more coverage than a conventional narrow-beam sounder. It is not ideal for buyers without a compatible Furuno display or transducer, because the DFF3D is a network black box.

Compatibility

Confirmed compatibility includes NavNet TZtouch, TZtouch2, TZtouch3, TZtouchXL, one Ethernet connection, and the DFF3D multi-beam transducer system. The supplied information does not identify Garmin, Raymarine, Lowrance, NMEA 2000, NMEA 0183, radar, or autopilot compatibility. No named incompatible system was provided.

Technical Specifications

- Brand: Furuno
- Model: DFF3D black box
- Technology: 165kHz multi-beam sonar
- Detection angle: 120 degrees side to side
- Modes: Cross Section, 3D Sounder History, Triple Beam, Side Scan
- Depth: 650 feet directly below; 1000 feet or more to the side
- Networking: One Ethernet port
- Compatibility: NavNet TZtouch, TZtouch2, TZtouch3, TZtouchXL
- Transducer: Required for operation
- Warranty: 2-year standard warranty

Warranty & Support

Furuno provides a 2-year standard warranty. The supplied specifications do not state warranty exclusions or service procedures.

The DFF3D is the Furuno choice when a boat needs broad multi-beam coverage and 3D history rather than a single narrow sonar cone. Its trade-off is the separate display and transducer installation. Choose it for a NavNet offshore system where Side Scan and 3D bottom views will be used regularly, not for a basic depth-only setup.