Garmin GMR 18 HD3 18" Radar Dome

Garmin GMR™ 18 HD3 18" Radar Dome (010-02843-00)

Experience powerful radar performance in a compact, efficient design with the Garmin GMR™ 18 HD3. Built for precision, safety, and reliability, this 18-inch marine radar dome combines intuitive operation with advanced scanning features that maximize awareness on the water. With 4 kW of transmit power, 36 nautical miles of range, and true color echo display, the GMR 18 HD3 delivers clear, detailed radar imaging in all weather and light conditions.

Ideal for recreational cruisers, anglers, and sailing vessels, this radar offers exceptional short- and long-range target detection while maintaining quiet, low-power operation. Whether you’re navigating through fog, tracking nearby vessels, or identifying coastal structures, the GMR 18 HD3 gives you the confidence to explore safely and efficiently.

Key Features

• Compact 18" Dome Design – Space-saving and sleek, ideal for boats of all sizes without compromising radar performance.
• 4 kW Power Output with 36 nm Max Range – Provides long-range visibility and detailed target separation for enhanced situational awareness.
• Dynamic Auto Gain – Automatically adjusts gain levels for optimal target returns in varying weather and sea conditions.
• Dynamic Sea Filter – Reduces sea clutter automatically, adapting to calm, moderate, and rough seas for a consistently clear view.
• Dual Radar Support – Connect two radar units for redundancy or multi-station use across your vessel.
• MARPA Target Tracking – Track multiple vessels simultaneously to assist in collision avoidance (requires a compatible heading sensor, sold separately).
• Radar Overlay – Overlay radar images onto your chartplotter maps when paired with a compatible Garmin GPSMAP® or ECHOMAP™ series display.
• Low-Noise Scanning – Reliable 24 rpm motor ensures quiet, energy-efficient operation with minimal interference.
• Close-Range Detection – Detects targets as close as 20 meters, ideal for navigating tight marinas or crowded waterways.
• High-Resolution 8-Bit True Color Display – Offers sharp, defined targets with less clutter, improving image clarity and precision.
• Timed Transmit Mode – Schedule radar transmission intervals to reduce power consumption during long runs or anchored operation.
• Easy Installation and Use – Simple setup with automatic modes for quick configuration and intuitive operation right out of the box.

In the Box

• GMR 18 HD3 Dome Radar
• Power Cable (15 m / 49.2 ft)
• Network Cable (15 m / 49.2 ft)
• Mounting Hardware Kit & Template
• Installation Instructions

Technical Specifications

• Dimensions: 20" (508 mm) diameter x 9.8" (248 mm) height
• Weight: 7.0 kg
• Antenna Length: 17" (43 cm)
• Beam Width: 5.2° horizontal, 25° vertical
• Rotation Speed: 24 rpm
• Range: 20 m (min) to 36 nm (max)
• Power Input: 11–32 V DC
• Transmit Power: 4 kW
• Power Consumption: 15 W standby / 40 W transmitting
• Waterproof Rating: IPX7

Why Choose the Garmin GMR 18 HD3

The Garmin GMR 18 HD3 is engineered to deliver dependable, high-definition radar performance in a sleek dome form. Whether you’re cruising offshore or fishing coastal waters, this radar provides crystal-clear target separation, automatic environmental tuning, and seamless chartplotter integration — all while maintaining whisper-quiet operation. Trusted by professional captains and recreational boaters alike, it’s your ultimate tool for safe navigation in any condition.