The Garmin GMR™ 18 HD3 (010-02366-53) is an 18-inch, 4 kW dome radar package supplied with a 15-meter power and network cable. Featuring a 36-nautical-mile detection range and short-range target separation down to 20 meters, it delivers target tracking using 8-bit true color presentation on compatible Garmin chartplotters. The system utilizes Dynamic Auto Gain and Dynamic Sea Filtering to automatically adjust to changing sea conditions, alongside features like MARPA target tracking, radar overlay, and Dual Range support. Operating at a fixed 24 RPM rotation speed, it accepts 11 to 32 VDC input, connects via the Garmin Marine Network, and carries an IPX7 water rating for harsh marine environments.

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

Technical Specification

General
Antenna Length	17″ (43 cm)
Rotation speed (RPM)	24 rpm
Dimension	20″ diameter, 9.8″ high (508 mm diameter, 248 mm high)
Weight	7.0 kg
Water rating	IPX7
Beam width	5.2° horizontal, 25° vertical
Maximum range	36 nm
Minimum range	20 meters
Radar type	Radome