Garmin GMR 436 xHD3 6 Open Array Radar & Pedestal – 4kW

The Garmin GMR 436 xHD3 is a 4 kW high-definition magnetron open-array marine radar with a six-foot antenna and pedestal. It is designed for compatible Garmin chartplotters using Garmin Marine Network or Garmin BlueNet connectivity, delivering radar coverage from 20 m to a maximum instrumented range of 72 NM. The narrow 1.1-degree horizontal beamwidth of the six-foot array helps distinguish closely spaced shoreline features, vessels, buoys, and other radar targets.

The system includes the 4 kW pedestal, six-foot antenna array, 15 m power cable, 15 m network cable, mounting hardware, and installation template. Features include dual-range operation, scan averaging, Dynamic Sea Filter, dynamic auto gain, echo trails, Bird Gain, and MARPA support when compatible heading and position data are available. The 72 NM range is manufacturer rated; real-world target detection depends on mounting height, target characteristics, radar settings, weather, sea state, and local interference.

Radar Integration

The GMR 436 xHD3 requires a compatible Garmin chartplotter or multifunction display for radar control and video display. Garmin Marine Network or Garmin BlueNet carries radar video and control data; NMEA 2000 supports compatible heading, GPS, AIS, autopilot, and vessel-sensor information but is not the primary radar-video connection.

MARPA tracking and radar overlay require compatible heading and position data. Bird Gain, dual-range monitoring, echo trails, and scan averaging depend on supported display functions and correct configuration. Radar is a navigation aid and does not replace a proper lookout, safe speed, official charts, local notices, or collision-regulation compliance.

Warranty and Saltwater Care

Garmin marine warranty coverage varies by region, distributor, proof of purchase, product registration, installation method, and intended use. Confirm the applicable local warranty terms, exclusions, and service process before purchase.

The radar is designed for marine exposure and has IPX6 ingress protection, but this rating does not guarantee immunity from salt spray or galvanic corrosion. Rinse salt deposits with fresh water where appropriate, avoid high-pressure spray at connectors and cable glands, inspect the pedestal, antenna array, mounting hardware, fasteners, and cable seals regularly, and use compatible marine-grade hardware plus manufacturer-approved isolation methods to reduce corrosion risk.

Before Ordering

Confirm compatible Garmin chartplotter support, Garmin Marine Network or BlueNet connection, suitability of the supplied 15 m power and network cables, 11V to 32V supply, six-foot array rotation clearance, mounting-platform strength, mounting height, personnel and compass-safe-distance requirements, heading and GPS sources for MARPA or radar overlay, optional AIS integration, and qualified installation requirements before purchase.