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color schemes, green indicates the target is moving away from
you and red indicates the target is moving toward you.
On some models, you can also adjust the M-Scope Sensitivity
setting to change the speed threshold for target highlighting. A
higher setting highlights slower targets, and a lower setting
highlights only faster targets.
Enabling a Guard Zone
You can enable a guard zone to alert you when anything comes
within a specified area around your boat.
From a radar screen, select Menu > Radar Options > Guard
Zone.
Defining a Circular Guard Zone
Before you can define the boundaries of the guard zone, you
must enable a guard zone (Enabling a Guard Zone, page 34).
You can define a circular guard zone that completely surrounds
your boat.
1
From a radar screen, select Menu > Radar Options > Guard
Zone > > Circle.
2
Select the location of the outer guard zone circle.
3
Select the location of the inner guard zone circle to define the
width of the guard zone.
Defining a Partial Guard Zone
Before you can define the boundaries of the guard zone, you
must enable a guard zone (Enabling a Guard Zone, page 34).
You can define the boundaries of a guard zone that does not
completely surround your boat.
1
From a radar screen, select Menu > Radar Options > Guard
Zone > > Corner 1.
2
Touch and drag the location of the outer guard-zone corner
.
3
Select Corner 2.
4
Select the location of the inner guard-zone corner to
define the width of the guard zone.
5
Select Done.
MARPA
Mini-automatic radar plotting aid (MARPA) enables you to
identify and track targets and is primarily used for collision
avoidance. To use MARPA, you assign a MARPA tag to a
target. The radar system automatically tracks the tagged object
and provides you with information about the object, including the
range, bearing, speed, GPS heading, nearest approach, and
time to nearest approach. MARPA indicates the status of each
tagged object (acquiring, lost, tracking, or dangerous), and the
chartplotter can sound a collision alarm if the object enters your
safe zone.
MARPA Targeting Symbols
Acquiring a target. Concentric, dashed green rings radiate from
the target while the radar is locking onto it.
Target has been acquired. A solid green ring indicates the
location of a target that the radar has locked onto. A dashed
green line attached to the circle indicates the projected course
over ground or the GPS heading of the target.
Dangerous target is in range. A red ring flashes from the target
while an alarm sounds and a message banner appears. After the
alarm has been acknowledged, a solid red dot with a dashed red
line attached to it indicates the location and the projected course
over ground or the GPS heading of the target. If the safe-zone
collision alarm has been set to Off, the target flashes, but the
audible alarm does not sound and the alarm banner does not
appear.
Target has been lost. A solid green ring with an X through it
indicates that the radar could not lock onto the target.
Closest point of approach and time to closest point of approach to
a dangerous target.
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 Menu > Layers > 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 >
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.
34 Radar
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  • How do I connect a non garmin camera to the Volvo Penta Glass cockpit (B-Series)? I would like to see and record my kids and they participate in watersports behind the boat as I drive. Submitted on 2-8-2023 at 21:29

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