Garmin GMR 18 xHD3 Dome
The Garmin GMR 18 xHD3 is an 18-inch dome (radome) marine radar, a self-contained rotating radar antenna designed for boats that want the compact, enclosed dome form factor over an open-array antenna — better suited to smaller flybridge and sailboat mast mounting where an open array's larger swing radius isn't practical. It outputs 4kW of transmit power with a maximum range of 48 nautical miles, giving genuine long-range vessel/weather/landmass detection for coastal cruising and offshore passages, not just close-range collision avoidance.
The dome measures roughly 20 x 9.8 inches and weighs 7.0kg, is IPX7 water-resistant, and spins at up to 60 RPM for fast target refresh. Beamwidth is 5.2° horizontal by 25° vertical, with a minimum detection range down to about 20 metres for tracking close-in targets like other vessels in a marina or channel. Runs on an 11-32V DC supply, drawing around 15W on standby and roughly 40W while transmitting in normal mode. Feature set includes Garmin's scan-averaging technology for cleaner target returns, improved target-size processing, split-screen dual-range display (viewing two radar ranges simultaneously), and bird detection mode for spotting feeding bird activity that often indicates baitfish and gamefish below. The dome-drive motor is engineered to run quietly compared to older radar designs.
Online price incl. VAT
Availability: Stock available — ships within 1-3 business days
Radar Performance
- Power output: 4 kW
- Max range: 48 nautical miles
- Rotation speed: Up to 60 RPM
- Minimum range: ~20 m
- Beamwidth: 5.2° horizontal / 25° vertical
Physical
- Dimensions: ~20 x 9.8 in (508 x 248 mm)
- Weight: 7.0 kg
- Waterproofing: IPX7
Electrical
- Power input: 11–32V DC
- Standby draw: ~15W
- Transmit draw (normal mode): ~40W
Features
- Included tech: Scan-averaging, target-size processing, split-screen dual-range, bird detection mode