Garmin GMR18 HD3 18in 4kW Radar Dome with 15m Cables

The Garmin GMR18 HD3 18in 4kW Radar Dome with 15m Cables is a professional-grade marine radar system engineered for serious anglers and cruising boaters who demand reliable target detection in all weather and sea conditions. This radar dome serves as the essential sensor head for medium-range navigation and fishing applications, delivering the situational awareness needed to navigate safely through fog, rain, and darkness while locating weather patterns and identifying structure on the water. Whether you're running a fishing charter, cruising coastal waters, or navigating inland lakes, this 4-kilowatt system provides the range and resolution necessary for confident passage and improved fishing success.

The 18-inch radome houses a high-performance 4kW magnetron that generates sharp, detailed radar imagery with excellent target discrimination and minimal sea clutter—critical for distinguishing between rain, land features, and other vessels at distances up to 24 nautical miles. The included 15-meter cable run allows flexible mounting options on towers, hardtops, or masts, accommodating various vessel configurations while maintaining signal integrity over the extended distance to your Garmin chartplotter. The sealed dome construction protects the antenna from saltwater corrosion and UV degradation, ensuring years of dependable performance in harsh marine environments.

This radar dome integrates seamlessly with compatible Garmin marine multifunction displays and chartplotters that support HD3 radar technology, making it an ideal upgrade for existing Garmin-equipped vessels or a core component of a new navigation suite. Professional installers and experienced boaters appreciate the GMR18 HD3's balance of power and manageable size—delivering genuine open-water performance without the extreme power draw or bulk of larger commercial systems. Installation requires proper mounting hardware, electrical connections, and network cabling to your display unit, tasks best handled by qualified marine electronics technicians to ensure optimal antenna placement and system calibration.