Garmin GMR 18 xHD Radome

We have the Garmin GMR 18 xHD Radome for sale. Designed for smaller vessels or installations where space is at a premium, this 18” high-definition radar dome delivers powerful 4kW transmit output, long-range performance, and superior echo clarity — all in a sleek, easy-to-install package.

Engineered to perform in every condition, the GMR 18 xHD features automatic gain and sea clutter adjustment, dual-range operation, and 8-bit true color high resolution to provide crisp target separation and reduce screen clutter. Whether navigating busy harbors, fishing offshore, or cruising unfamiliar waters, this radar provides the awareness and safety you need.

With plug-and-play simplicity, dual-range radar views, and optional MARPA tracking, the GMR 18 xHD enhances your Garmin marine network, making it an ideal choice for serious boaters looking for top-tier performance in a space-saving design.

What’s Included

• Garmin GMR 18 xHD Radome

• Mounting hardware kit

• Power cable (15 m / 49.21 ft)

• Network cable (15 m / 49.21 ft)

• Installation instructions

• Mounting template

• Grommet for marine cable

Key Features

⚡ Compact Yet Powerful

• 18” radar dome with 4-kW transmit power for excellent performance at all ranges.

• Max range of 48 nautical miles and dual 24/48 RPM rotation speeds for fast screen refresh rates.

🔎 High-Resolution Imaging

• 8-bit true color resolution enhances target separation and reduces clutter on your Garmin chartplotter.

⚙️ Easy to Use

• No complex settings — simple plug-and-play operation makes installation and use effortless.

🌊 Auto Gain and Sea Clutter Control

• Dynamic Auto Gain optimizes performance for nearshore, harbor, and offshore conditions.

• Dynamic Sea Filter automatically adapts to calm, moderate, or rough seas.

🧭 Dual-Range Operation

• Display close and long-range targets simultaneously on split screens with independent settings.

🚫 No Transmit Zone

• Define a protected zone behind the radar to avoid radiation exposure — perfect for flexible installation options.

🗺️ Radar Overlay

• Overlay radar returns directly onto your chartplotter’s map page for situational clarity.

• Requires compatible heading sensor or autopilot (sold separately) for best results.

🎯 MARPA Target Tracking

• Track up to 10 targets using MARPA functionality with a compatible multifunction display and heading sensor (sold separately).

Garmin GMR 18 xHD Radome Specifications

General

• Dome Diameter: 20″ (50.8 cm)

• Height: 9.75″ (24.8 cm)

• Weight: 17 lbs (7.7 kg)

• Waterproof Rating: IPX7

• Antenna Length: 17″ (43.18 cm)

• Rotation Speeds: 24 and 48 RPM

• Beam Width: 5.2° horizontal, 25° vertical

• Maximum Range: 48 nautical miles

• Minimum Range: 20 meters

• Radar Type: Radome

Electrical

• Power Input: 11–35 V DC

• Transmit Power: 4 kW

Radar Features

• Dual Range: ✔

• Radar Overlay: ✔

• Dual Radar Support: ✔

• Auto Gain: ✔

• MARPA Tracking: ✔

• Dynamic Sea Filter: ✔

• No Transmit Zone: ✔

Benefits

• Ideal for Small Boats – Compact 18” dome fits perfectly on vessels with limited radar space.

• Superior Target Definition – True color and high resolution provide crisp detail and reduced screen noise.

• Automatic Optimization – Adapts to real-world conditions with no manual tuning needed.

• Increased Situational Awareness – Dual-range display, radar overlay, and MARPA tracking give a complete radar picture.

• Seamless Integration – Pairs perfectly with Garmin chartplotters and heading sensors for advanced features.

• Fast and Simple Installation – Everything you need is in the box, with a straightforward setup process.

FAQs

Q: What is the difference between the GMR 18 xHD and GMR 24 xHD?
A: The GMR 18 xHD is more compact and better suited for smaller vessels, while the GMR 24 xHD offers a larger antenna with a narrower beamwidth for enhanced long-range resolution.

Q: Can I use this radar for offshore navigation?
A: Yes. With 4-kW power and up to 48 nm range, it’s great for offshore, harbor, and coastal use.

Q: Does it support radar overlay?
A: Yes, radar overlay is supported. A heading sensor or compatible autopilot is required for full functionality (sold separately).

Q: Can I track moving targets with MARPA?
A: Absolutely. When connected to a Garmin multifunction display and a heading sensor, the unit can track up to 10 MARPA targets simultaneously.

Q: Is it difficult to install?
A: Not at all. The package includes a mounting template, hardware, and all necessary cables for an easy installation process.

Q: Is this radar waterproof?
A: Yes, it is rated IPX7, making it highly water-resistant and suitable for all marine environments.