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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

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.

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

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.

Â

25 mm (1 in.)

Center of rotation to the inner rear mounting holes.

Ã

125 mm (4 

15

/

16

 in.) Center of rotation to the inner front mounting holes.

Ä

50 mm (1 

15

/

16

 in.)

Center of rotation to the outer rear mounting holes.

Å

150 mm (5 

29

/

32

 in.) Center of rotation to the outer front mounting holes.

Æ

140 mm (5 

1

/

2

 in.)

Ç

200 mm (7 

7

/

8

 in.)

5

Summary of Contents for GMR 424 xHD2

Page 1: ...Considerations When selecting a mounting location observe these considerations It is highly recommended that the device is mounted out of range of people with the vertical beam width above head heigh...

Page 2: ...nting surface place the shoulder washers on the threaded rods and feed them into the mounting surface so they fit securely 4 Place the flat washers lock washers and hex nuts on the threaded rods 5 Tor...

Page 3: ...tage converter unit to properly power the device If your model is packaged with a voltage converter it must be installed in order for your radar to function If your model is not packaged with a voltag...

Page 4: ...are controlled with your Garmin chartplotter See the Radar section of your chartplotter s manual for operating instructions To download the latest manual go to www garmin com support Software Update...

Page 5: ...t 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 anten...

Page 6: ...protected against heavy seas Bearing accuracy 0 25 degrees Electrical Specifications Specification Measurement Minimum safe operating distance GMR 424 xHD2 100 W m 1 22 m 48 in 10 W m 3 90 m 154 in G...

Page 7: ...ble Extensions section of these instructions to make sure the correct wire gauge is used Power Cable Extensions page 4 If the radar uses a voltage converter it may be connected through an incompatible...

Page 8: ...2014GarminLtd oritssubsidiaries support garmin com TA 2013 1848...

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