Garmin GPSMAP 8000 Series Gebruikershandleiding - Pagina 23
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3
Enter the time interval between radar signal transmissions.
4
Select Transmit Time.
5
Enter the duration of each radar signal transmission.
Enabling a Guard Zone
Select Radar > Sentry > Menu > Sentry Setup > Enable
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).
You can define a circular guard zone that completely
encompasses your boat.
1
Select Radar > Sentry > Menu > Sentry Setup > Adjust
Guard Zone > Adjust 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
You can define the boundaries of a guard zone that does not
completely encompass your boat.
1
Select Radar > Sentry > Menu > Sentry Setup > Adjust
Guard Zone > Adjust Guard Zone > Corner 1.
2
Touch and drag the location of the outer guard-zone corner
.
3
Select Corner 2.
4
Touch the location of the inner guard-zone corner
the width of the guard zone.
Radar Targeting and MARPA
Radar targeting enables you to identify and track objects.
Mini-automatic radar plotting aid (MARPA) 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.
22
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 the Harbor, Offshore, or Cruising Radar screen, select
an object or location.
2
Select Acquire Target > MARPA Target.
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.
Removing a MARPA Tag from a Targeted Object
1
From the Radar screen, select a MARPA target.
2
Select MARPA Target > Remove.
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.
to define
1
From a Radar screen or the Radar overlay, select 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
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 the VRM and the EBL
The VRM and the EBL configured for one mode are applied to
other radar modes.
NOTE: The VRM and the EBL cannot be changed in sentry
mode.
From a radar screen, select Menu > Show VRM/EBL.
Radar