The Garmin GMR™ 1236 xHD3 (K10-00012-27) is a commercial-grade open-array marine radar system that pairs a 12 kW magnetron pedestal with a 6-foot open-array antenna to deliver target detection up to 72 nautical miles. Featuring a narrow 1.1-degree horizontal beamwidth, it provides fine target separation and resolution of small objects, shorelines, and distant weather cells. The radar operates with dual rotation speeds of 24 and 48 RPM for rapid display refresh rates on compatible Garmin chartplotters. Digital signal processing features include scan-averaging technology to filter out sea clutter and surface noise, angular target-size processing to improve object definition, True Echo Trails for historical target movement tracking, and Dual Range mode for simultaneous short- and long-range monitoring on a split display. The system also supports Auto Bird Gain, MARPA target tracking for up to 30 targets, radar chart overlay, and Dynamic Auto Gain and Sea Filtering. Housed in a heavy-duty enclosure rated for 100-knot winds, it operates on 10 to 32 VDC power systems, connects via the Garmin Marine Network (or Garmin BlueNet™), carries an IPX6 water resistance rating, and is supplied as a complete bundle with 15-meter power and network cabling.

In the Box

GMR xHD3 12 kW open array radar with 4’ or 6’ antenna (depending on model selected)
Power cable (15 m/49.21 ft)
Network cable (15 m/49.21 ft)
Voltage converter
Mounting hardware kit and template
Installation instructions

Technical Specification

General
Antenna Length	4′ array: 48″ (122 cm) 6′ array: 72″ (183 cm)
Rotation speed (RPM)	24 and 48 rpm
Dimension	4′ array: 1325 x 122 x 170 mm (52.2″ x 4.8″ x 6.7″) 6′ array: 1938 x 122 x 170 mm (76.5″ x 4.8″ x 6.7″) Pedestal: 520 x 328 x 314 mm (20.5″ x 12.9″ x 12.4″)
Weight	4′ array and pedestal: 27.7 kg 6′ array and pedestal: 29.7 kg
Water rating	IPX6
Max Wind Load	100kt
Beam width	4′ array: 1.8° horizontal, 23° vertical 6′ array: 1.1° horizontal, 23° vertical
Maximum range	96 nm
Minimum range	20 meters
Radar type	Open-array

Electrical Features
Power Input	10-32 V DC
Power Consumption (standby)	18 W
Typical power consumption, transmitting (normal mode)	70 W
Transmit power	12 kW

Radar Features
Dual range	✓
Overlay	✓
Dual radar support	✓
Auto Bird Gain	✓
Auto Gain	Dynamic
MARPA target tracking	yes (requires heading sensor, sold separately)
Echo Trails	True
Programmable antenna parking	✓
Target size	✓
Scan averaging	✓