The Garmin GMR 18 xHD3 is an 18″ dome radar with 4 kW magnetron transmit power and 48 NM range. Scan Averaging Technology filters sea clutter for enhanced target consistency. Angular target-size processing and true echo trails improve situational awareness. Rotation up to 60 RPM for fast target updates. Auto Bird Gain assists with finding fish. Connects to compatible Garmin chartplotters via Garmin Marine Network. Supplied with 15m power and network cables.
Specifications
- Dome Size: 18″ (508 mm diameter)
- Transmit Power: 4 kW
- Max Range: 48 nautical miles
- Min Range: 20 metres
- Rotation Speed: Up to 60 RPM
- Beam Width: 5.2° horizontal, 25° vertical
- Power Input: 11–32V DC
- Standby / Transmit: 15W / 40W typical
- Weight: 7.0 kg
- Water Resistance: IPX7
- Included Cables: 15m power + 15m network
- Features: Scan Averaging, True Echo Trails, Auto Bird Gain, MARPA (heading sensor required), Dual Range, Radar Overlay




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