Garmin International Inc 02120D Manuel D’Utilisation

• To show the tracks of AIS vessels, select Trails, and

select the length of the track that appears.

The variable range marker (VRM) and the electronic bearing

line (EBL) measure the distance and bearing from your boat

to a target object. On the Radar screen, the VRM appears as

a circle that is centered on the present location of your boat,

and the EBL appears as a line that begins at the present

location of your boat and intersects the VRM. The point of

intersection is the target of the VRM and the EBL.

The VRM and the EBL configured for one mode are applied

to all other radar modes.

From a Radar screen, select Menu > Show VRM/EBL.

Before you can adjust the VRM and the EBL, you must show

them on the Radar screen (page 18).
You can adjust the diameter of the VRM and the angle of the

EBL, which moves the intersection point of the VRM and the

EBL. The VRM and the EBL configured for one mode are

applied to all other radar modes.

From a Radar screen, select a new location for the

intersection point of the VRM and the EBL.

Select 

Drop VRM/BLE.

Select Stop Pointing.

Before you can adjust the VRM and the EBL, you must show

them on the Radar screen (page 18).

From a Radar screen, select the target location.

Select Measure Distance
The range and the bearing to the target location appear in

the upper-left corner of the screen.

When you connect your chartplotter to an optional Garmin

marine radar, you can use the Radar overlay to overlay radar

information on the Navigation chart or on the Fishing chart.
The Radar overlay superimposes radar information on the

Navigation chart or the Fishing chart. Data appears on the

Radar overlay based on the most recently used radar mode

(Cruising, Harbor, Offshore, or Sentry), and all settings

configurations applied to the Radar overlay are also applied

to the last-used radar mode. For example, if you use Harbor

mode and then you switch to the Radar overlay, the Radar

overlay would show Harbor mode radar data. If you changed

the gain setting using the Radar overlay menu, the gain

setting for Harbor mode would change automatically.

When using the Radar overlay, the chartplotter aligns radar

data with chart data based on the boat heading, which is

based by default on data from a magnetic heading sensor

connected using a NMEA 0183 or NMEA 2000 network. If a

heading sensor is not available, the boat heading is based on

GPS tracking data.

GPS tracking data indicates the direction in which the boat is

moving, not the direction in which the boat is pointing. If the

boat is drifting backward or sideways due to a current or

wind, the Radar overlay may not perfectly align with the chart

data. This situation should be avoided by using boat-heading

data from an electronic compass.
If the boat heading is based on data from a magnetic heading

sensor or an automatic pilot, the heading data could be

compromised due to incorrect setup, mechanical malfunction,

magnetic interference, or other factors. If the heading data is

compromised, the Radar overlay may not align perfectly with

the chart data.

The Radar overlay displays data based on the most recently

used radar mode.

Select Radar > Radar Overlay.
The radar picture appears in orange and overlays the

Navigation chart.

From the Radar screen, select Menu > Radar to

Standby.

You can adjust the radar display settings for reduced clutter

and increased accuracy.
NOTE: You can optimize the radar display for each radar

mode.

Select a radar range (page 18).

Restore the default value of the gain setting (page 18).

Adjust the gain setting manually (page 19).

The range of the radar signal indicates the length of the

pulsed signal transmitted and received by the radar. As the

range increases, the radar transmits longer pulses in order to

reach distant targets. Closer targets, especially rain and

waves, also reflect the longer pulses, which can add noise to

the Radar screen. Viewing information about longer-range

targets can also decrease the amount of space available on

the Radar screen for viewing information about shorter-range

targets.

Auto is the default value for the gain setting. The automatic

gain setting for each Radar mode is optimized for that mode,

and may differ from the automatic gain setting used for

another mode.
NOTE: Depending upon the radar in use, the gain setting

configured for use in one radar mode may or may not be

applied to other Radar modes or to the Radar overlay.

From a Radar screen or the Radar overlay, select Menu

> Gain > Auto.
The chartplotter sets the gain automatically once, based

on average conditions, the range of the radar signal, and

the selected radar mode. The chartplotter does not

readjust the gain automatically in response to changing

conditions.

18

Radar

DRAFT