Distance
Wire Gauge
6.5 m (21 ft. 3 in.)
6.63 mm² (9 AWG)
8 m (26 ft. 2 in.)
8.36 mm² (8 AWG)
Grounding the Radar
The radar (and voltage converter, if applicable) must be connected to the
appropriate type of ground using a 3.31 mm² (12 AWG) copper wire (not
included).
1
Route a 3.31 mm² (12 AWG) copper wire to a water ground location and to
the radar pedestal.
2
Connect the wire to the ground connector on the pedestal ( ) using the
pre-installed crimp connector.
3
Coat the ground screw and crimp connector with marine sealant.
4
Connect the other end of the wire to the water ground location on the boat,
and coat the connection with marine sealant.
5
Select an option:
• If your radar was not packaged with a voltage converter, no further
grounding is necessary.
• If your radar was packaged with a voltage converter, proceed to step 6.
6
Route a different 3.31 mm² (12 AWG) copper wire to water ground location
and to the voltage converter.
7
Loosen a screw on one corner of the voltage converter and secure the
copper wire to the screw.
8
Coat the screw and wire on the voltage converter with marine sealant.
9
Connect the other end of the wire to the RF ground location on the boat,
and coat the connection with marine sealant.
Garmin Marine Network Considerations
This device connects to Garmin Marine Network devices to share radar data
with compatible devices on the network. When connecting to a Garmin Marine
Network device, observe these considerations.
• A Garmin Marine Network cable must be used for all Garmin Marine
Network connections.
◦ Third-party CAT5 cable and RJ45 connectors must not be used for
Garmin Marine Network connections.
◦ Additional Garmin Marine Network cables and connectors are available
from your Garmin dealer.
• Although it is not recommended, you can use a field-installable connector
to create a custom-length Garmin Marine Network cable if necessary.
Follow the directions provided with the connector.
Radar Operation
All functions of this radar are controlled with your Garmin chartplotter. See the
Radar section of your chartplotter's owner's manual for operating instructions.
To download the latest manual, go to support.garmin.com.
If you have more than one radar on your boat, you must be viewing the radar
screen for the radar you want to configure.
Specifying the Antenna Size
Before you can use the radar on your system, you must specify the antenna
size.
1
Turn on the radar and all devices connected to the Garmin Marine
Network.
An antenna-selection prompt appears on the connected chartplotters.
NOTE: If the entire system is being turned on for the first time, the
antenna-selection screen is part of the initial setup process.
2
Select the installed antenna size for each open-array radar installed on the
boat.
TIP: If you need to specify a different antenna size, while viewing the radar
screen for the radar you want to change, select Menu > Radar Setup >
Installation > Antenna Configuration > Antenna Size, and select the
antenna size.
Front-of-Boat Offset
The front-of-boat offset compensates for the physical location of the radar
scanner on a boat, if the radar scanner does not align with the bow-stern axis.
Measuring the Potential Front-of-Boat Offset
The front-of-boat offset compensates for the physical location of the radar
scanner on a boat, if the radar scanner does not align with the bow-stern axis.
1
Using a magnetic compass, take an optical bearing of a stationary target
located within viewable range.
2
Measure the target bearing on the radar.
3
If the bearing deviation is more than +/- 1°, set the front-of-boat offset.
Setting the Front-of-Boat Offset
Before you can set the front-of-boat offset, you must measure the potential
front-of-boat offset.
The front-of-boat offset setting configured for use in one radar mode is applied
to every other radar mode and to the Radar overlay.
1
From a Radar screen or the Radar overlay, select Menu > Radar Setup >
Installation > Front of Boat.
2
Select Up or Down to adjust the offset.
Setting a Custom Park Position
By default, the antenna is stopped perpendicular to the pedestal when it is not
spinning. You can adjust this position.
1
From the radar screen, select Menu > Radar Setup > Installation >
Antenna Configuration > Park Position.
2
Use the slider bar to adjust the position of the antenna when stopped, and
select Back.
Specifications
Pedestal weight
21.4 kg (47.1 lb.)
Antenna weight
4 ft. antenna: 5.5 kg (12.2 lb.)
6 ft. antenna: 7.7 kg (16.9 lb.)
Power cable length
15 m (49 ft. 3 in.)
Network cable length
15 m (49 ft. 3 in.)
Antenna rotation speed
24 rpm and 48 rpm
Maximum wind load
80 kn
Temperature range
GMR 420/620/1200 xHD2: From -15 to 70ºC (from 5
to 158ºF)
GMR 2520 xHD2: From -15 to 60ºC (from 5 to
140ºF)
Humidity
95% at 35°C (95°F)
Water rating
IEC 60529 IPX6 (protected against heavy seas)
Bearing accuracy
0.25 degrees
Input voltage
From 10 to 32 Vdc
Fuse
Radar power cable, no voltage converter: 15 A
Radar power cable, with voltage converter (if
applicable): 10 A
Voltage converter (if applicable): 30 A
Input power GMR 424 and 426
• Typical: 55 W
• Max.: 160 W
Input power GMR 624 and 626
• Typical: 65 W
• Max.: 170 W
Input power GMR 1224 and
1226
• Typical: 90 W
• Max.: 125 W
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