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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 Target
> 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 MENU
> Other Vessels > List
> Show
.
2
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 MENU >
Radar Menu
> Other Vessels > Display Setup
.
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
MARPA >
Show
.
To set the projected heading time for AIS-activated
vessels, select Proj. Heading, and enter the time.
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 the VRM and the EBL
From a radar screen, select MENU
> Radar Options > Show
VRM/EBL
.
Adjusting the VRM and the EBL
Before you can adjust the VRM and the EBL, you must show
them on the Radar screen (Showing the VRM and the EBL,
page 26).
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 a new location for the
intersection point of the VRM and the EBL.
2
Select
Drop VRM/EBL.
3
Select
Stop Pointing.
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 (Showing the VRM and the EBL,
page 26).
1
From a Radar screen, select the target location.
2
Select
Measure Distance.
The range and the bearing to the target location appear in the
upper-left corner of the screen.
Radar Overlay
When you connect your chartplotter to an optional Garmin
marine radar, you can use overlay radar information on the
Navigation chart or on the Fishing chart.
Data appears on the radar overlay based on the most recently
used radar mode and all settings configurations applied to the
radar overlay are also applied to the last-used radar mode.
Radar Overlay and Chart Data Alignment
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.
Echo Trails
The echo trails feature enables you to track the movement of
vessels on the radar display. 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:
Not all options and settings are available on all radar and
chartplotter models.
Turning on Echo Trails
From a radar screen, select MENU
> Radar Options > Echo
Trails > Display
.
Adjusting the Length of the Echo Trails
1
From a radar screen or the radar overlay, select MENU >
Radar Options > Echo Trails > Time.
2
Select the length of the trail.
Clearing the Echo Trails
You can remove the echo trails from the radar screen to reduce
the clutter on the screen.
From a radar screen, select MENU > Radar Options
> Echo
Trails > Clear Trails
.
Optimizing the Radar Display
You can adjust the radar display settings for reduced clutter and
increased accuracy.
26 Radar
34


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