Garmin GMR 18 HD Radome

The GMR 18 HD features high-powered Digital Signal Processing, providing sharper radar imagery and improved target separation.

This 18″ (45.7 cm), 4 kW high definition radar has a 36 nm range, bringing radar images into even clearer focus. With automatic pulse optimization technology, the radar matches pulse widths and repetition rates with the nautical mile range that is selected. Combine that with the antenna’s 5 degree beam width, and you’re looking at the best weather penetration and target definition in its class.

What’s in the box:

  • GMR 18 HD
  • Mounting hardware kit
  • Power cable (15 m/49.21 ft)
  • Network cable (15 m/49.21 ft)
  • Installation instructions
  • Field install RJ-45 network cable connector
  • Mounting template
  • Grommet for marine cable


Physical dimensions18″ diameter, 9.3″ high (45.7 cm diameter, 23.6 cm high)
Weight15.8 lbs (7.2 kg)
Water ratingIPX7
Power consumption33.5 W typical
Antenna length17″ (43.18 cm)
Rotation speed (RPM)24/30 rpm (dual rotation)
Transmit power4 kW
Power input10.5-35 V DC
Beam width5.0° horizontal, 25° vertical
Maximum range36 nm
Minimum range20 meters
Radar typeRadome
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