Viewing A List Of Ais And Marpa Threats; Showing Ais Vessels On The Radar Screen; Vrm And Ebl - Garmin GPSMAP 12 3 Series Owner's Manual

Viewing a List of AIS and MARPA Threats

From any Radar screen or the Radar overlay, you can view and customize the appearance of a list of AIS and
MARPA threats.
1 From a Radar screen, select Options > Layers > Other Vessels.
2 Select an option:
• To view a list of AIS threats, select AIS > AIS List.
• To view a list of MARPA threats, select MARPA > MARPA List.
3 If necessary, select Display Options > Show, and select the type of threats to include in the list.

Showing AIS Vessels on the Radar Screen

AIS requires the use of an external AIS device and active transponder signals from other vessels.
You can configure how other vessels appear on the Radar screen. If any setting (except the AIS display range)
is configured for one radar mode, the setting is applied to every other radar mode. The details and projected
heading settings configured for one radar mode are applied to every other radar mode and to the Radar overlay.
1 From a Radar screen or the Radar overlay, select Options > Layers > Other Vessels > AIS.
2 Select an option:
• To indicate the distance from your location within which AIS vessels appear, select Display Range, and
select a distance.
• To show details about AIS-activated vessels, select Details > Show.
• To set the projected heading time for AIS-activated vessels, select Proj. Heading, and enter the time.
• To show the tracks of AIS vessels, select Trails, and select the length of the track that appears.

VRM and EBL

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.
Showing and Adjusting the VRM and the EBL
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.
1 From a radar screen, select Options > Radar Options > VRM/EBL >
2 Select a new location for the intersection point of the VRM and the EBL
3 Select Done.
Measuring the Range and Bearing to a Target Object
Before you can adjust the VRM and the EBL, you must show them on the Radar screen
the VRM and the EBL, page 98).
1 From a Radar screen, select the target location.
2 Select Measure.
The range and the bearing to the target location appear in the upper-left corner of the screen.
98
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(Showing and Adjusting
Radar