Description
The FURUNO DRS4D-NXT is a 24-inch solid-state Doppler radome built for boaters who want Furuno’s higher-end NavNet radar tools in a compact enclosed antenna. Rather than relying on a conventional magnetron, the NXT platform uses a 25 W solid-state transmitter with pulse-compression processing, so the radar is ready to transmit quickly and does not require routine magnetron replacement. The practical value is not simply lower maintenance: Furuno combines the solid-state transmitter with Doppler processing, Target Analyzer, Fast Target Tracking, RezBoost beam sharpening and dedicated operating modes that make the radar far more informative than a basic range-and-bearing display.
- 25 W solid-state Doppler radar: Delivers pulse-compression radar performance without magnetron warm-up, while Doppler processing supplies information used by Furuno’s collision-awareness tools.
- 48 NM maximum range: Covers close-quarters harbour work through coastal navigation and weather observation, with range scales extending from very short range to 48 nautical miles.
- Target Analyzer and Fast Target Tracking: Helps the operator identify approaching traffic visually and rapidly develops course/speed vectors for tracked targets.
- RezBoost beam sharpening: Furuno signal processing improves apparent angular separation so targets that would otherwise merge together can be shown more distinctly.
- NavNet system integration: Compatible with supported Furuno NavNet TZtouch generations and newer Furuno navigation platforms, making the radar a system sensor rather than a stand-alone display.
Solid-State Radar Designed for Fast, Repeatable Use
One of the largest ownership differences between an NXT radome and a traditional pulse radar is the transmitter. The solid-state architecture eliminates the magnetron, so there is no magnetron warm-up period and no magnetron component to replace as part of normal long-term service. That makes the radar particularly attractive on boats where the operator powers the system up frequently for short runs, harbour departures, night manoeuvring or changing weather.
Furuno’s pulse-compression processing allows the relatively low nominal transmitter power to produce strong detection performance across a wide range of distances. The result should not be compared directly with magnetron radar strictly by wattage: the signal architecture is different, and the usable radar performance comes from the combination of transmitted waveform, receiver processing and target analysis.
Target Analyzer: Traffic Risk at a Glance
Target Analyzer uses Doppler information to help distinguish targets that may present a collision risk. On supported Furuno displays, echoes can be colour-coded so an approaching target is visually differentiated from a target that is stationary or moving away. This is useful in crowded approaches, ferry lanes, fishing grounds and reduced visibility because the operator can direct attention toward the contacts whose relative movement matters most.
Target Analyzer does not replace proper watchkeeping, AIS interpretation or collision-avoidance judgement, but it reduces the amount of mental filtering required when a radar screen contains many echoes. It is one of the key reasons to choose an NXT sensor over a conventional basic radome.
Fast Target Tracking and Vector Information
Fast Target Tracking is designed to develop a tracked target’s course and speed vector in seconds rather than forcing the operator to wait through a long acquisition period. With compatible heading and navigation data in the system, target vectors provide a much more useful picture of surrounding traffic than raw radar echoes alone. Doppler-assisted automatic vector presentation for approaching vessels further improves awareness when traffic density rises.
RezBoost and Beamwidth
The physical horizontal beamwidth of the DRS4D-NXT is approximately 3.9°, but Furuno’s RezBoost processing can sharpen the displayed radar picture beyond what the raw antenna beam alone would suggest. Better angular separation matters when two boats, buoys, pilings or shoreline features lie at similar ranges. It can make harbour entrances, channel edges and closely spaced targets easier to interpret.
Bird Mode and Fishing Use
NXT radar is not limited to navigation. Furuno’s Bird Mode automatically adjusts radar settings to improve detection of birds working over bait or feeding fish. Offshore anglers can use this as another search tool when covering large areas of water. The radar still requires proper antenna height, sea conditions and operator interpretation, but the dedicated mode removes much of the repetitive gain and sea-clutter adjustment normally needed when searching for weak bird echoes.
Dual-Range and Close-Quarters Awareness
On compatible Furuno MFDs, dual-range operation can show two different radar ranges at the same time. A skipper can keep one window focused on close traffic while a second window watches a broader area for weather, land or approaching vessels. This is especially useful when running from a harbour entrance into open water or when navigating along a coastline in variable visibility.
System Compatibility and Cabling
The DRS4D-NXT is a radar sensor, not a complete radar system by itself. Radar presentation, chart overlay and advanced controls are provided by a compatible Furuno display. Furuno lists NXT dome compatibility across multiple NavNet TZtouch generations and newer systems; exact features can vary with the connected display and software level. The sensor requires a Furuno DRS signal/power cable selected separately for the vessel’s cable run, so the installation should be planned before ordering.
Heading data becomes especially important when using radar overlay, true-motion presentations and target-tracking features. For higher-end installations, a Furuno satellite compass such as the SCX20 or another suitable heading source can materially improve the quality of heading-dependent radar functions.
Installation Considerations
Radar performance depends heavily on antenna placement. Mount the radome where its horizontal view is as unobstructed as practical and where people cannot enter the transmitted beam at unsafe distances. Avoid locations where masts, towers, rocket launchers or other metal structures create large blind sectors. The mounting surface must also be rigid and level enough to prevent movement that changes the radar horizon. Cable routing should maintain weatherproof integrity and avoid unnecessary proximity to high-current conductors or other interference sources.
What’s in the Box
- DRS4D-NXT 24-inch solid-state Doppler radar sensor
- Standard mounting / installation hardware supplied with the sensor
- Installation documentation
Specifications
- Radar type: X-band solid-state Doppler radome
- Antenna diameter: 24 in
- Transmit power: 25 W solid-state
- Maximum range: 48 NM
- Horizontal beamwidth: Approx. 3.9°
- Rotation: Range-coupled / selectable operation depending on connected display and mode
- Target functions: Target Analyzer, Fast Target Tracking; additional features depend on compatible MFD/software
- Signal processing: Pulse compression and RezBoost beam sharpening
- Fishing feature: Bird Mode
- Power: 12/24 VDC
- Network: Furuno NavNet Ethernet radar connection through DRS signal/power cable
- Signal/power cable: Sold separately; select length for installation
- Application: Navigation, collision awareness, weather observation and offshore fishing support
- Installation: External radome; rigid marine mounting surface required
- Approx. sensor weight: 7.3 kg sensor
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