Overview

The Garmin GMR xHD3 is a 4 kW dome radar with a 48 nm maximum range that runs on 11 to 32 V DC and connects to a compatible Garmin chartplotter or MFD through the Garmin Marine Network. It is available in 18 inch and 24 inch radome sizes and carries an IPX7 water rating.

On the screen, you can run split-screen dual range, overlay radar on your chart, and use features like scan averaging and target-size processing to keep returns readable when sea clutter and interference start to build. Rotation speeds up to 60 rpm help keep target updates moving fast, which matters when you are threading a busy channel or tracking a squall line.

Anglers can use bird detection with Auto Bird Gain, and skippers who want tracking tools can use MARPA target tracking for up to 30 targets when a suitable heading sensor is on the system. This radar is a good match for boats already built around a Garmin networked helm and for crews who want one antenna to cover close-quarters work and longer-range awareness.

Key features

• 4 kW transmit power with 48 nm maximum range and 20 m minimum range
• 11 to 32 V DC input for 12 V and 24 V systems
• Typical power draw: 15 W standby and 40 W transmitting (normal mode)
• Up to 60 rpm antenna rotation for quicker target updates
• Split-screen dual range plus radar overlay on compatible displays
• Scan averaging, dynamic auto gain, and dynamic sea filter to manage clutter as conditions change
• True echo trails for motion history on targets
• Auto Bird Gain and bird detection for finding surface activity
• MARPA target tracking for up to 30 targets (requires an appropriate heading sensor)
• Guard zone alarms and range/bearing cues for quick situational checks
• IPX7 water rating for incidental water exposure

Variants

This radar dome is offered in multiple configurations based on radome size.

The size option changes the physical footprint, antenna length, and horizontal beam width. Core electrical specs and feature set remain the same across the 18 inch and 24 inch versions, including 4 kW output, 48 nm maximum range, and 11 to 32 V DC power input.

• 010-02841-00: Size 18" (20" x 9.8", 7.0 kg, 17" antenna length, 5.2° horizontal beam width). This option keeps the mounting footprint smaller on hardtops, arches, and sailboat structures where space is limited.
• 010-02842-00: Size 24" (25.4" x 9.8", 8.7 kg, 23" antenna length, 3.7° horizontal beam width). The narrower horizontal beam width can help separate targets more clearly at range on the display.

What’s included

• GMR 18 or 24 xHD3 dome radar (depending on model selected)
• Power cable (15 m / 49.21 ft)
• Network cable (15 m / 49.21 ft)
• Garmin Marine Network Adapter Cable Small (Male) to Large (15 cm)
• Mounting hardware kit and template
• Installation instructions

Installation and setup

Plan the mounting location so the radome has a clear view with minimal blockage from masts, spreaders, lights, and other hardware. The base should be flat and parallel to the vessel waterline, with structure underneath that can support the radar weight and vibration loads. On some hardtops, raising the radar helps keep the roof edge from shading the beam.

Keep clear of magnetic compasses by maintaining at least 1.1 m separation for the 18 inch model and 0.95 m for the 24 inch model. Route cables with chafe protection, seal deck penetrations with marine sealant, and secure the run so it will not work loose over time.

Electrical and network integration

Power is 11 to 32 V DC, with a typical 7.5 A fuse requirement on the supply. Standby draw is 15 W, and typical transmitting draw in normal mode is 40 W, so the radar can stay available without heavily loading the house system.

Network connection is through the Garmin Marine Network to a compatible chartplotter or MFD. Radar overlay and MARPA functions require appropriate sensors on the boat, and dual radar support allows redundancy when multiple radar sources are installed.

Maintenance and care

Rinse the radome with fresh water after salt use and keep the outer surface free of heavy grime that can hold salt. Periodically check mounting fasteners, cable condition, and strain relief points, especially after rough-weather runs or long trailering days.