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.
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 (
).
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.
Echo Trails
The echo trails feature enables you to track the movement
of vessels on the radar display. As a vessel moves, you
can see a faint trail
of the vessel's wake. You can
change the length of time the trail is displayed.
NOTE:
Depending upon the radar in use, the settings
configured for use in one radar mode may or may not be
applied to other radar modes or to the radar overlay.
NOTE:
This feature is not available on xHD open array or
HD/HD+ radome models.
Turning on Echo Trails
From a radar screen, select
Options
>
Radar Options
>
Echo Trails
>
Display
.
Adjusting the Length of the Echo Trails
1
From a radar screen or the radar overlay, select
Options
>
Radar Options
>
Echo Trails
>
Time
.
2
Select the length of the trail.
Radar
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