Specification
Measurement
Fuse
7.5 A
Power output
4 kW peak
RF transmit frequency
9410 MHz nominal
GMR 18 HD+ and 18 xHD beam
width
5.2 degrees
GMR 24 xHD beam width
3.7 degrees
Maximum range GMR 18/24 xHD
48 nm
Maximum range GMR 18 HD+
36 nm
Minimum range
20 m (66 ft.)
Range discrimination
16 m (52.5 ft.)
*When it is transmitting, the radar should be located in a position
on the vessel that is at least this far from people. (IEC 60936-1,
clause 3-27.1, specifies the maximum distances from the
antenna at which radio frequency (RF) levels can be expected.)
Detailed Dimensions
Item
GMR 18 HD+ and 18 xHD
GMR 24 xHD
Length
508.2 mm (20 in.)
645.4 mm (25
7
/
16
in.)
À
(width)
504.7 mm (19
7
/
8
in.)
642.5 mm (25
5
/
16
in.)
Á
(height)
248.3 mm (9 ¾ in.)
250.3 mm (9
7
/
8
in.)
Item GMR 18 HD+ and 18 xHD
GMR 24 xHD
À
233 mm (9
3
/
16
in.)
233 mm (9
3
/
16
in.)
Á
176.7 mm (6
15
/
16
in.)
245.4 mm (9
11
/
16
in.)
Â
141.5 mm (5
9
/
16
in.)
141.5 mm (5
9
/
16
in.)
Ã
190 mm (7 ½ in.)
258.5 mm (10
3
/
16
in.)
Ä
139.2 mm (5 ½ in.)
207.7 mm (8
3
/
16
in.)
Item GMR 18 HD+ and 18 xHD
GMR 24 xHD
Å
141.5 mm (5
9
/
16
in.)
141.5 mm (5
9
/
16
in.)
Æ
227.5 mm (8
15
/
16
in.)
296.2 mm (9
11
/
16
in.)
Installation Troubleshooting
Symptom
Possible Causes
The radar does
not turn on. The
status LED is not
on.
• The power cable may not be connected correctly
to the device or to the battery. Check all
connections.
• The inline fuse may have blown. Check the fuse
and replace it if necessary.
• The wire gauge used to extend the power cable
may be too small for the length of the extension.
Check the table provided in the Power Cable
Extensions section of these instructions to make
sure the correct wire gauge is used (
).
The radar is not
available on the
Garmin device or
on devices
connected to the
Garmin Marine
Network.
• The radar may not be powering on. Check the
status LED.
• The device software may not be up-to-date.
Update the software on the device or on the
Garmin Marine Network.
• The network cable may not be connected
correctly to the device or to the Garmin Marine
Network. Check all connections.
• If a field-installable network connector was used,
it may have been installed improperly. Check the
connector.
The status LED is located on the product label, and can help
troubleshoot installation problems.
Status LED Color
and Activity
Radar Status
Solid red
The radar is getting ready for use. The LED
should be solid red briefly and change to flashing
green.
Flashing green
The radar is operating properly.
Flashing orange
The radar software is being updated.
Flashing red
The radar has encountered an error. Contact
Garmin product support for assistance.
© 2016 Garmin Ltd. or its subsidiaries
Garmin® and the Garmin logo are trademarks of Garmin Ltd. or its subsidiaries,
registered in the USA and other countries. GMR™ is a trademarks of Garmin Ltd. or its
subsidiaries. These trademarks may not be used without the express permission of
Garmin.
© 2016 Garmin Ltd. or its subsidiaries
support.garmin.com
TA-2013/1848
2302
