Garmin GMR 18 xHD Radome Marine Radar

The Garmin GMR 18 xHD is a compact dome radar designed for boats where available installation space is limited but clear radar information is still important. This 18-inch high-definition radome combines 4 kW of transmit power with a maximum range of 48 nautical miles, while 24- and 48-RPM rotation options provide fast screen refreshes for changing conditions.

Key Features

• 18-inch dome radar: A compact format suited to boats with limited radar mounting space.
• 4 kW transmit power: Provides the radar power specified for the GMR 18 xHD.
• Up to 48 nautical miles: The specified maximum radar range supports long-range situational awareness.
• 24- or 48-RPM rotation: Selectable rotation speeds provide fast radar refreshes.
• 8-bit true-color high resolution: Designed to improve target separation and reduce visual clutter on a compatible chartplotter.
• Dynamic Auto Gain: Automatically adjusts gain levels for harbor, near-shore and offshore conditions.
• Dynamic Sea Filter: Automatically adjusts sea-clutter filtering for calm, medium and rough conditions.
• Dual-range operation: Allows independent close- and long-range radar views on compatible equipment.
• No-transmit zone: Provides an installation option for protecting selected areas behind the radar from transmission.
• Radar overlay: Radar information can be overlaid on a compatible chartplotter map page.
• MARPA target tracking: MARPA is available when the radar is combined with a compatible multifunction display and heading sensor.

Garmin GMR 18 xHD Specifications

Radar Performance and Target Detection

The GMR 18 xHD is designed to provide clear echo definition across its specified range. Its 8-bit true-color high-resolution presentation is intended to improve target separation and reduce unnecessary screen clutter when radar information is displayed on a compatible chartplotter.

Dynamic Auto Gain adjusts radar gain for different operating environments, including harbors, near-shore waters and offshore conditions. The Dynamic Sea Filter similarly adjusts sea-clutter filtering as conditions change from calm to medium or rough seas. These automatic functions are useful when operating in environments where radar conditions can change during a trip.

Dual-Range Radar Operation

Dual-range operation allows close and distant radar views to be displayed independently. This can help an operator monitor nearby traffic while maintaining a separate view of targets farther from the vessel.

Radar Overlay and MARPA

Radar overlay can place radar information over a compatible chartplotter map page, bringing radar and chart information together for situational awareness. MARPA target tracking is also supported when the GMR 18 xHD is used with a compatible multifunction display and a heading sensor. The heading sensor is a separate component.

Installation Considerations

The compact dome format makes the GMR 18 xHD suitable for boats where radar mounting space is limited. Before installation, confirm that the selected mounting position provides the required field of view and does not interfere with other equipment. The no-transmit-zone feature can provide additional flexibility when a protected area behind the radar is required.

Who Is the Garmin GMR 18 xHD For?

This radar is suited to boat owners who need a compact marine radar with a specified 4 kW transmit power, 48-nautical-mile maximum range, automatic gain and sea-clutter management, dual-range operation, radar overlay and MARPA capability. It can be considered for recreational and practical navigation setups where a dome radar is preferable to a larger open-array installation.

Why Buy Marine Radar from Performance Engines?

Performance Engines provides marine radar equipment alongside other navigation products for boat owners comparing marine electronics and propulsion equipment. Review the available marine radar systems to compare different radar formats and specifications, or contact Performance Engines if you need help reviewing the product information before purchase.

Garmin GMR 18 xHD FAQ

What is the maximum range of the Garmin GMR 18 xHD?

The specified maximum range of the Garmin GMR 18 xHD is 48 nautical miles.

How much transmit power does the GMR 18 xHD have?

The GMR 18 xHD has a specified transmit power of 4 kW.

What rotation speeds are available?

The GMR 18 xHD supports 24-RPM and 48-RPM rotation speeds.

Does the GMR 18 xHD support dual-range radar?

Yes. Dual-range operation allows independent close- and long-range radar views on compatible equipment.

Does the Garmin GMR 18 xHD support MARPA?

Yes. MARPA target tracking is supported when the radar is combined with a compatible multifunction display and heading sensor.

Can the GMR 18 xHD provide radar overlay?

Yes. Radar overlay can be used on a compatible chartplotter map page.