Installation Instructions

Specification Measurement
Fuse Radar power cable, no voltage converter: 15 A
(included)
Radar power cable, with voltage converter (if
applicable): 7.5 A (included)
Voltage converter (if applicable): 15 A (not
included)
Input power GMR 424 and 426:
• Typical: 55 W
• Max.: 160 W
GMR 624 and 626:
• Typical: 65 W
• Max.: 170 W
GMR 1224 and 1226:
• Typical: 90 W
• Max.: 125 W
Range Pulse Width Pulse Repetition Frequency (PRF)
0.125 nm 70 µs 5120 Hz
0.25 nm 70 µs 5120 Hz
0.5 nm 80 µs 5120 Hz
0.75 nm 90 µs 5120 Hz
1 nm 150 µs 5120 Hz
1.5 nm 200 µs 3840 Hz
2 nm 250 µs 2560 Hz
3 nm 350 µs 2560 Hz
4 nm 400 µs 1280 Hz
6 nm 700 µs 1280 Hz
8 nm 700 µs 1280 Hz
12 nm 800 µs 1280 Hz
16 nm 1000 µs 640 Hz
24 nm 1000 µs 640 Hz
36 nm 1000 µs 640 Hz
48 nm 1000 µs 640 Hz
64 nm 1000 µs 640 Hz
72 nm 1000 µs 640 Hz
Antenna Specifications
Specification Measurement
Type End-fed slotted waveguide
Horizontal beam width 4 ft. antenna: 1.8º
6 ft. antenna: 1.1º
Horizontal side lobes -23 dB within ±10º of main
-30 dB outside ±10º of main
Vertical beam width 23º
Antenna gain 29 dB
Polarization Horizontal
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 (Power Cable
Extensions).
• If the radar uses a voltage converter, it may be
connected through an incompatible or third-party
voltage converter. Use only the voltage converter
supplied with the radar.
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. This should
only stay red briefly before changing 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.
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