Garmin GMR 18 HD3 18" Radar Dome

Regular price $1,799.99 USD
Sale price

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Garmin GMR 18 HD3 18" Radar Dome
Garmin GMR 18 HD3 18" Radar Dome
Regular price $1,799.99 USD
Sale price

GMR 18 HD3 18" Radar Dome

This compact 18" dome radar combines ease of use with powerful scanning features that work to maximize your confidence and situational awareness on the water.


  • 4 KW power output, 36 nautical mile max range
  • Space-saving 18" dome
  • Marpa target tracking
  • Dynamic auto gain and sea filter
  • Dual-radar support
  • Quiet dome drive motor

Dual-Radar Support 

Using dual radar provides redundancy and allows each display unit on the boat to pull data from one of two different radar sources.

Dynamic Auto Gain

Gain automatically adjusts levels to optimum settings.

Dynamic Sea Filter

Radar gain automatically adjusts sea clutter for calm, medium and rough sea conditions.

Radar Overlay

Overlay radar images onto your chartplotter’s map page. You can add an optional autopilot or heading sensor (sold separately) for the best results.

MARPA Target Tracking

MARPA tracks selected targets to help keep track of other vessels and avoid collisions (with appropriate sensors, sold separately).

Low-Noise Scanning 

The reliable GMR HD3 dome drive motor spins at a fixed 24 rpm, offering reliable, low-noise operation and minimal power consumption.

Compact and Powerful

4 kW of transmit power, a 36 nautical mile maximum range, and clear echo definition at all ranges.

Close-In Target Scanning

Minimum scanning range of 20 meters for excellent short-range detection and target detail.

High-Resolution Radar

8-bit true color for outstanding target separation with less screen clutter.

Timed Transmit Mode

Specify transmit times down to the seconds to help reduce power consumption.

Intuitive operation

No complex user settings, so it’s easy to install and start using.

In the Box:

  • GMR 18 HD3 dome radar
  • Power cable (15 m/49.21 ft)
  • Network cable (15 m/49.21 ft)
  • Mounting hardware kit and template
  • Installation instructions


  • Dimensions: 20" diameter, 9.8" high (508 mm diameter, 248 mm high)
  • Weight: 7.0 kg
  • Waterproof: IPX7
  • Antenna length: 17" (43 cm)
  • Rotation Speed (RPM): 24 rpm
  • Beam Width: 5.2° horizontal, 25° vertical
  • Maximum Range: 36 nm
  • Minimum Range: 20 meters
  • Radar Type: Radome

Electrical Features:

  • Power Input: 11-32 v DC
  • Power Consumption (Standby): 15 W
  • Typical Power Consumption, Transmitting (Normal Mode): 40 W
  • Transmit Power: 4 KW

Radar Features:

  • Overlay: Yes
  • Dual Radar Support: Yes
  • Auto Gain: Dynamic
  • MARPA Target Tracking: Yes (requires heading sensor, sold separately)


  • Array Size (Inches): 18"
  • Power - Output: 4kW
  • Range - Max (Miles): 36nm
  • Box Dimensions: 13"H x 24"W x 24"L WT: 30.1 lbs
  • UPC: 753759320737

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