Marine Radar

1st Watch Wireless Radar Model DRS4W

The world's first wireless Radar that you can access directly from your iOS devices.

The FURUNO DRS4W is the first radar antenna in the world that allows you to wirelessly access radar images on your iOS devices, combining ease of use with great flexibility. After installing and setting up the application available from the Apple store for free, you can watch radar images directly on your iPad or iPhone. You are free to move around on your boat whilst still having complete information of your surroundings.

Recreational Boats
Auto Tuning (Sensitivity)


  • Move around and explore.

    With the new 1st Watch Wireless Radar, you can do things previously impossible. You can bring the Radar display where ever you go, even put it on the iPhone in your pocket.
  • Get it at the 1st glance.

    Plug in the Radar, set up the app from App Store and you're good to go. With familiar gestures it's a breeze to use, you can even use two iOS devices simultaneously.
  • Less cables, more flexibility.

    Installation is simple with its compact and lightweight Radar antenna. Mount it, plug in the power cord and you're done.
  • A 4kW radar antenna, powerful yet compact in size.

  • The world's first radar that allows you to wirelessly access radar images on your iOS devices.

  • With image quality that matches that of a conventional 10" wired Radar, the DRS4W will impress you

  • Download the Marine Radar app from Apple App Store that is available for free.

  • Guard zone alarm available with updated Marine Radar App ver.2.0.0

  • Simple touch interface with familiar gestures.



Peak Output Power
4 kW
ø488 mm Radome (19 inch)
9410MHz±30MHz, P0N
Beam Width (Horizontal)
7.2°(3 dB)
Beam Width (Vertical)
25°(3 dB)
Range Scales
0.125 to 24 nm
Antenna Rotation Speed
24 rpm
5.7 kg


Display Unit
iPad/iPad mini/iPhone (Customer supply)
Display Mode
Auto Gain, Auto STC, Rain, Auto Noise rejector, Sector blank, Off center, Cursor (measure target), Guard Zone alarm


Temperature: -25°C to + 55°C


Power Supply / Consumption Current
12-24 VDC: 2.1/1.0 A

Equipment List


  • Antenna Unit RSB-126
  • Power cable 10/15/20/30 m


  • Radome mount OP03-93


  • DRS4W Brochure
    (Last update: Mar 23, 2023)

* Specifications subject to change without notice.