Acquiring MARPA Targets Automatically
You can acquire MARPA targets automatically based on MotionScope, guard zones, or boundaries.
1 From a radar screen, select Options > Layers > Other Vessels > MARPA > Auto Acquire.
2 Select , and adjust additional settings (optional).
Assigning a MARPA Tag to an Object
Before you can use MARPA, you must have a heading sensor connected and an active GPS signal. The heading
sensor must provide the NMEA 2000 parameter group number (PGN) 127250 or the NMEA 0183 HDM or HDG
output sentence.
1 From a radar screen, select an object or location.
2 Select Acquire Tgt. > MARPA Target.
Removing a MARPA Tag from a Targeted Object
1 From the Radar screen, select a MARPA target.
2 Select MARPA Target > Remove.
Viewing Information about a MARPA-tagged Object
You can view the range, bearing, speed, and other information about a MARPA-tagged object.
1 From a radar screen, select a targeted object.
2 Select MARPA Target.
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.
Radar 99
To Next Page