NOTE:
In order for the software update instructions to
appear, the device must be fully booted before the card is
inserted.
3
Follow the on-screen instructions.
4
Wait several minutes while the software update process
completes.
The device returns to normal operation after the software
update process is complete.
5
Remove the memory card.
NOTE:
If the memory card is removed before the device
restarts fully, the software update is not complete.
Specifying the Antenna Size
Before you can use the radar on your system, you must specify
the antenna size.
You must mount the radar, connect it to power, and connect it to
the Garmin Marine Network before you can 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 powered 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
>
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
>
Front of Boat
.
2
Select
Up
or
Down
to adjust the offset.
Setting a Custom Park Position
If you have more than one radar on your boat, you must be
viewing the radar screen for the radar you want to adjust.
By default, the antenna is stopped perpendicular to the pedestal
when it is not spinning. You can adjust this position (optional).
1
From the radar screen, select
Menu
>
Radar Setup
>
Antenna Configuration
>
Park Position
.
2
Use the slider bar to adjust the position of the antenna when
stopped, and select
Back
.
Specifications
Dimensions
Item Measurement
Description
À
181.8 mm (7
3
/
16
in.) Center of rotation to the rear of the pedestal.
Á
236.2 mm (9
5
/
16
in.) Center of rotation to the front of the pedestal.
GMR 420/620/1220/2520 xHD2 Series Installation Instructions
5
