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Item no. 81776
Only 1 in stock
Shipping information:
SVB price: €1,260.46
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This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
€1,260.46 This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
Item no.
Model no.
Garmin - GMR 18 HD+ radar antenna
Antenna type
Tx power
4000 W
Max. range
36 nm
Beam width
5.2 °
Doppler mode
Rotational speed
24 RPM
7.7 kg
Shipping information

Product details

The compact size of the Garmin GMR18 HD+ radome radar antenna makes it ideal for boats where radar antenna space is limited. Its 4 kW transmit power ensures clear signals are transmitted and received over all ranges, making it easier to interpret radar echoes, increasing situational awareness, especially in poor visibility. Received radar echoes can be laid over a Garmin chartplotter map as a so-called radar overlay. For a smooth and jitter-free radar overlay the use of an optional heading sensor such as the 9-Axis Heading Sensor (item: 81775) or an autopilot system with heading sensor is necessary. Furthermore, the Garmin GMR18 HD+ in combination with a compatible heading sensor and a multifunction display supports further functions such as MARPA (Mini-Automated-Radar-Plotting-Aid) target tracking.

Thanks to the dynamic automatic amplification of echoes, the radar image adapts to the current surroundings, thus ensuring optimum performance in all conditions. In addition, the dynamic sea state filter adjusts sea clutter depending on the current sea conditions. A clear display on Garmin chartplotters is achieved by the GMR18 HD+'s 8-bit True Color resolution. Maximum range is 36 nautical miles, minimum range is a good 20 meters and rotation speed is 24 rpm.

  • 18-inch radome radar with 4 kW output in aerodynamic design
  • 4 kW transmission power enables the GMR18 HD+ to deliver clear signals over all ranges
  • Dynamic Auto Gain automatically adjusts to your surroundings to ensure optimal performance in all conditions
  • Dynamic sea state filter automatically adapts to changing sea conditions
  • Displays the radar image superimposed on the chartplotter chart page (autopilot or heading sensor recommended for best results)

Technical specifications
Type radome
Voltage 11 - 35 V
Typical power consumption 30 W.
Maximum power consumption 48 W.
Transmission power 4 kW
Rotation speed 24 rpm
Beam width horizontal: 5.2 °
vertical: 25 °
Minimal area 20 m
Maximum area 36 nm
Radar overlay support Yes
Tracking via MARPA Optional (heading sensor required)
High definition Yes
Protection zone alarm Yes
Water resistance IPX7
Dimensions (Øxheight) 508 x 248 mm
Weight 7.7 kg

  • GMR 18 HD + radom antenna
  • Mounting kit
  • Power cable (15 m)
  • Network cable (15 m)
  • Installation instructions
  • Mounting template


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fr-flag Manual
PDF, 491,19 KB
it-flag Manual
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Technical question

User image of Jan B.
Jan B. asked
on Sep 21, 2020
Flag of English i want to connect this dome to the Garmin GPSMAP 922 , can that be connected to the backbone cable ? with a spur cable ? ( NMEA2000?)
User image of Arne C.
Arne C. answered
on Sep 21, 2020
Hi Jan, No this is not possible. The connection can only be done by using the Ethernetport
User image of Stanka G.
Stanka G. asked
on Dec 19, 2022
Flag of English hi, i bought Bavaria 46 (2017), it came with Garmin GPSMAP922 in saloon, Garmin GHC 20 autopilot, 2 Garmin GMI 20 in cockpit. i need to instal (Radar,AIS transponder and chart plotter in cockpit) i was thinking to move the GPSMAP 922 to cockpit and buy #GARMIN GPSMAP 723 #93859# to install in nav station. for radar i think of #GARMIN GMR 18 HD+ Radar Antenna #81776#. can you please in light me if this is my best option or no, do i need extra connections or cables apart from the connection included in the package, and for AIS i don't know which Transponder to buy that is compatible with the Garmin devices!! was thinking of #AMEC CAMINO-108S AIS Transponder / integr. splitter / GPS patch antenna #95564#. your input will be highly recommended
User image of Cory V.
Cory V. answered
on Mar 10, 2023
Dear customer, please email our technician at in this specific case.