Description
The GARMIN GMR Fantom 18x is a 18-inch solid-state dome radar with 50 W pulse-compression power, MotionScope Doppler target highlighting and fast scan capability. The white housing is designed for integrated Garmin chartplotter systems on cruising and fishing boats.
Main Features
- 50 W solid-state pulse-compression radar with up to 48 nautical mile range
- MotionScope Doppler processing highlights moving targets by relative motion
- Fast rotation up to 60 RPM for responsive close-range updates
- 18-inch dome format for enclosed marine installations
- Garmin chartplotter networking for radar display, overlay and target tools
Solid-state radar
Fantom technology replaces a traditional high-power magnetron with solid-state pulse compression. This provides rapid start-up, strong short-range discrimination and efficient target processing while retaining useful long-range performance.
MotionScope Doppler
MotionScope uses Doppler processing to help identify targets moving toward or away from the vessel. This can make traffic patterns easier to interpret in busy waterways, although radar remains an aid to navigation and does not replace a proper lookout.
Fishing and weather use
Beyond collision avoidance, radar can help locate birds, squalls and shoreline features. Performance depends heavily on mounting height, target size and environmental conditions.
System integration
Pair the radome with a compatible Garmin network chartplotter. Heading input from a suitable sensor improves overlay and target-stabilization functions, and a full Garmin helm can combine radar with AIS, sonar and autopilot information.
Understanding radar range
The headline maximum range is only one part of radar performance. Close-range target separation, horizontal beamwidth, mounting height and signal processing matter greatly in real-world navigation. A larger antenna aperture generally provides better angular discrimination, which is one reason the 24-inch Fantom dome can separate nearby targets more effectively than a smaller dome. Small fiberglass boats, buoys and low shorelines may be harder to detect than large ships or land masses.
Radar overlay and heading sensors
Radar overlay is most useful when the chartplotter has accurate heading information from a suitable sensor such as a Garmin heading/GNSS source. Course-over-ground alone can be inadequate at low speed or while maneuvering. Proper heading data helps align radar returns with the electronic chart and supports target-processing features on compatible Garmin systems.
Doppler and target interpretation
Fantom models add MotionScope Doppler processing, which can visually emphasize targets based on relative motion and make busy traffic easier to interpret. Doppler is an aid, not an automatic collision-avoidance system. Operators should understand relative motion, maintain appropriate range settings and use target trails, guard zones and MARPA/AIS tools where supported by the connected chartplotter.
Mounting and safety considerations
Radar performance depends on a rigid, level mounting surface with a clear view around the vessel. The scanner should be installed at an appropriate height and with the manufacturer-specified separation from people, compasses, antennas and other equipment. Cable bends, water ingress and shadowing from masts or hardtop structures can all affect performance. Follow Garmin’s RF exposure and installation requirements exactly.
What’s in the Box
GMR Fantom 18x radar dome (White), power cable, network cable, mounting hardware/template and documentation; exact cable lengths vary by package.
Specifications
- Radar type: 50 W solid-state pulse-compression dome
- Maximum range: Up to 48 nautical miles
- Rotation: Up to 60 RPM
- Doppler: MotionScope supported
- Horizontal beamwidth: Approximately 5.2°
- Color: White
- Water rating: Marine-rated exposed installation
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