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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

5

Summary of Contents for GMR 620 xHD2 Series

Page 1: ...Drill and 15 0 mm 19 32 in drill bit 17 mm 21 32 in wrench and torque wrench A length of 3 31 mm 12 AWG copper wire to ground the radar housing and voltage converter if applicable Marine sealant Mount...

Page 2: ...o the four raised locations on the bottom of the pedestal Mounting the Radar Before you can mount the radar you must first select a mounting location and prepare the mounting surface and the radar Pre...

Page 3: ...er Cable Extensions Incorrectly extended runs of cable may cause the radar to malfunction due to insufficient power transmission Connecting to Power Through the Voltage Converter WARNING When connecti...

Page 4: ...ing is necessary If your radar was packaged with a voltage converter proceed to step 6 6 Route a different 3 31 mm 12 AWG copper wire to water ground location and to the voltage converter 7 Loosen a s...

Page 5: ...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 o...

Page 6: ...m 49 ft 3 in Network cable length 15 m 49 ft 3 in Antenna rotation speed 24 rpm and 48 rpm Max wind load 80 kn Temperature range From 15 to 70 C 5 to 158 F Humidity 95 at 35 C 95 F Water resistance I...

Page 7: ...he 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...

Page 8: ...r countries GMR is a trademark of Garmin Ltd or its subsidiaries These trademarks may not be used without the express permission of Garmin Furuno is a registered trademark of Furuno Electric Co Ltd Ra...

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