Furuno DFF3 Network Sounder
Best high-performance sounder for serious deep-sea anglers and professional captains.
Transform your NavNet display into a powerful fish finder with the Furuno DFF3 Network Sounder. This black box unit utilizes Furuno Digital Filter (FDF) technology for exceptional clarity and target detection. It supports dual-frequency operation across a wide range of frequencies, making it ideal for both shallow and deep water exploration. With selectable output power up to 3kW, you can achieve detailed bottom structure and fish detection down to nearly 10,000 feet, enhancing your fishing experience.
$1399.95
Owner Satisfaction
4.7
/ 5
Category Rank
4
/ 167
#4 in Fish Finders
Price vs Category Average
+37%
Above average
Output Power
123
/ Selectable kW, kW, or kW
Who it's for
- Captains building a fully integrated NavNet vessel network
- Deep-sea anglers needing precise target separation in extreme depths
- Serious fishermen requiring clear, interference-free sonar imagery
Who should skip it
- Budget-conscious boaters avoiding high-end transducer and display costs
- DIY owners preferring simple plug-and-play sonar installations
- Small-vessel operators with limited battery and power capacity
Performance breakdown
Deep water penetration
Reaches depths of 10,000 feet with professional-grade signal clarity.
Target separation
Digital filter technology isolates fish from bottom structure with precision.
System versatility
Selectable power outputs adapt perfectly to varying coastal and offshore conditions.
Integration ease
Simple Ethernet connection makes adding sonar to NavNet displays seamless.
Transducer compatibility
Broad frequency support allows for highly customized sonar configurations.
Display clarity
Multi-color echo modes provide excellent visual feedback for identifying targets.
Key Specs
Output Power
Selectable 1kW, 2kW, or 3kW
Operating Frequencies
Dual-frequency selection between 28 to 200 kHz
Maximum Depth Range
Up to 3,000 meters (nearly 10,000 feet)
Filter Technology
Furuno Digital Filter (FDF)
Connectivity
Single Ethernet cable connection
Compatibility
NavNet, NavNet TZtouch series displays
Sonar Technology
Traditional Sonar
Echo Presentation
8/16/64 color modes
Features
- Turns NavNet displays into powerful fish finders
- FDF technology for clearer pictures and better targets
- Automatic detection for shallow and deep water
- White line feature for bottom structure
- Selectable cruising or fishing modes
- Audio and visual alarms for depth and fish
- Wide variety of compatible transducer options
What customers say
Users consistently praise the DFF3 for its professional grade reliability, establishing it as a trusted device for serious offshore fishing. A key highlight is the best in class sonar quality, particularly in deep water, which delivers superior target separation and bottom discrimination. Although the initial investment is substantial, owners confirm that the robust performance and unwavering accuracy provide exceptional value for dedicated marine professionals and serious enthusiasts.
Know before you buy
The DFF3 is designed to integrate with Furuno NavNet and NavNet TZtouch series displays. It connects via a single Ethernet cable, allowing you to view sonar data directly on your existing multi-function display.
The DFF3 is compatible with a wide variety of transducers, but because it supports selectable power outputs up to 3kW and dual frequencies, you must ensure your chosen transducer is rated to handle your desired power and frequency settings.
With the correct transducer and the 3kW output setting, the DFF3 is capable of reaching depths of up to 3,000 meters, or nearly 10,000 feet. This makes it a robust choice for deep-water offshore fishing.
FDF technology processes the sonar signal to filter out surface noise and clutter while sharpening the return of fish targets. This results in a much cleaner, high-definition image on your display, making it easier to distinguish fish from the bottom structure.
Yes, the DFF3 features selectable output power of 1kW, 2kW, or 3kW. You can adjust this setting depending on your depth requirements, using lower power for shallow water to reduce clutter and higher power for deep-sea exploration.
The white line feature helps you identify fish that are holding tight to the bottom. By displaying the top edge of the bottom structure in white, it creates a clear contrast that makes it easier to spot fish echoes that would otherwise blend into the seabed.
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$1400