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 (
).
• 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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