GMR™ 1236 xHD3 Radar open-array and pedestal

The Garmin GMR 1236 xHD3 radar is an open-array 12 kW system designed to provide reliable detection of obstacles, weather, and marine traffic.

This radar offers extended detection range, from 20 meters for close targets to 96 nautical miles for long-range detection.

The Garmin GMR 1236 xHD3 radar is supplied with a 6-foot (approximately 183 cm) beam antenna.

The GMR 1236 xHD3 integrates several advanced technologies to improve target detection and display:

Scan Averaging: Reduces sea clutter and interference for better target identification.Angular target size adjustment: Uses pulse expansion and processing techniques to optimize object display across all range scales.True Echo Trails: Displays historical boat trajectories, facilitating quick identification of moving targets and collision risks.

Yes, the GMR 1236 xHD3 radar has an IPX6 waterproof rating, meaning it is protected against powerful water jets and heavy waves.

The Dual Range function with overlay allows you to display radar images side by side on a compatible chartplotter. You can thus use independent range settings for simultaneous short- and long-range monitoring.

For radar installation, you will need the following tools:

A Phillips screwdriver #2
A 5 mm and a 6 mm Allen key
A drill and 15.0 mm (19/32 in) and 32 mm (1 1/4 in) drill bits
A 17 mm (21/32 in) wrench and a torque wrench
A 3.31 mm² (12 AWG) copper wire for grounding the radar housing
Marine sealant

When selecting a mounting location, consider the following points:

The radar must be mounted out of reach of people, with the vertical beam above head height. It must be installed high above the vessel's keel line, with minimal obstruction to the radar beam. The mounting surface must be flat, parallel to the waterline, and sufficiently robust to support the radar's weight. The location must allow easy connection to power, ground, and the network. The radar must be kept away from heat sources (exhausts, lights) and other electronic equipment (at least 2 m from the beam path). To avoid interference with a magnetic compass, comply with the specified safety distance.

The GMR 1236 xHD3 radar requires an input voltage of 10 to 32 V DC. If a voltage converter is used, it must also support this voltage range.

The radar must be connected to a water ground (water ground), not to the negative terminal of the battery. A 3.31 mm² (12 AWG) copper cable is required for this connection, but it is not included with the product.

When drilling or cutting, it is essential to always check what is on the other side of the surface to avoid damaging the vessel. Additionally, to prevent injury, it is recommended to always wear safety glasses, hearing protection, and a dust mask.

Yes, to ensure the best possible performance and avoid potential injury or damage to the equipment or vessel, installation by a qualified marine installer is strongly recommended.

The radar power cable contains an inline 15 A fuse. If a voltage converter is used, an additional 30 A fuse must be installed between the voltage converter and the boat’s battery. Both fuses must be in place for correct operation.

The GMR 1236 xHD3 radar is compatible with compatible Garmin chartplotters. It connects via the Garmin BlueNet™ network or the Garmin Marine Network to display radar data.

Yes, the radar emits electromagnetic energy. To avoid interference, other electronic equipment and cables must be mounted at least 2 meters (6.5 feet) from the radar beam path. GPS antennas must be above or below the beam path. Minimum distances are also required for magnetic compasses (according to product specifications), transmission equipment (at least 1 m), and VHF/SSB radios (at least 1 m for VHF, 2 m for SSB).

No, the radar grounding cable must be connected to a water ground (water ground) and not to the boat's battery negative terminal.

Garmin non-aviation products, including the GMR 1236 xHD3 radar, are warranted against material or manufacturing defects for one year from the date of purchase.

Garmin warranty may be voided in several cases, including:

The device is opened by someone other than a Garmin authorized service technician.The power cable is connected without the appropriate fuse in place.The product has been modified or altered without Garmin’s written authorization.The product has been damaged by an accident, abuse, misuse, water, flood, fire, or other external causes.

Yes, a mounting template is included in the product box to simplify installation. It is recommended to use this supplied template rather than printing your own.