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The projected course of an activated AIS target appears as a
dashed line on a chart or a 3D chart view. The length of the
projected course line is based on the value of the projected
heading setting. If an activated AIS target is not transmitting
speed information, or if the vessel is not moving, a projected
course line does not appear. Changes in the speed, course over
ground, or rate of turn information transmitted by the vessel can
impact the calculation of the projected course line.
When course over ground, heading, and rate of turn information
are provided by an activated AIS target, the projected course of
the target is calculated based on the course over ground and
the rate of turn information. The direction in which the target is
turning, which is also based on the rate of turn information, is
indicated by the direction of the barb at the end of the heading
line. The length of the barb does not change.
When course over ground and heading information are provided
by an activated AIS target, but rate of turn information is not
provided, the projected course of the target is calculated based
on the course over ground information.
Showing AIS and MARPA Vessels on a Chart or on a
3D Chart View
Before you can show AIS vessels on a chart, you must have an
external AIS device and active transponder signals from other
vessels. Mini Automatic Radar Plotting Aid (MARPA)
functionality works with radar.
You can configure how other vessels appear on a chart or on a
3D chart view. The display range and MARPA settings
configured for one chart or one 3D chart view are applied only
to that chart or to that 3D chart view. The details, projected
heading, and trails settings configured for one chart or one 3D
chart view are applied to all charts and to all 3D chart views.
1
From a chart or a 3D chart view, select Menu > Chart Menu
> Other Vessels > Display Setup.
2
Select an option:
• To indicate the distance from your location in which AIS
vessels appear, select Display Range, and select a
distance.
• To show MARPA-tagged vessels, select MARPA >
Show.
• To show details about AIS-activated and MARPA-tagged
vessels, select Details > Show.
• To set the projected heading time for AIS-activated and
MARPA-tagged vessels, select Proj. Heading, and enter
the time.
• To show the tracks of AIS vessels, select the length of the
track that appears using a trail, select Trails, and select
the length.
Activating a Target for an AIS Vessel
1
From a chart or a 3D chart view, select an AIS vessel.
2
Select AIS Vessel > Activate Target.
Viewing Information about a Targeted AIS Vessel
You can view the AIS signal status, MMSI, GPS speed, GPS
heading, and other information that is reported about a targeted
AIS vessel.
1
From a chart or a 3D chart view, select an AIS vessel.
2
Select AIS Vessel.
Deactivating a Target for an AIS Vessel
1
From a chart or a 3D chart view, select an AIS vessel.
2
Select AIS Vessel > Deactivate.
Charts and 3D Chart Views
Viewing a List of AIS and MARPA Threats
1
From a chart or a 3D chart view, select Menu > Other
Vessels > AIS & MARPA List > Show.
2
Select the type of threats to include in the list.
Setting the Safe-Zone Collision Alarm
Before you can set a collision alarm, you must have a
compatible chartplotter connected to an AIS device or radar.
The safe-zone collision alarm is used only with AIS and
MARPA. MARPA functionality works with radar. The safe zone
is used for collision avoidance and can be customized.
1
Select Settings > Alarms > AIS > Collision Alarm > On.
A message banner appears and an alarm sounds when a
MARPA-tagged object or an AIS-activated vessel enters the
safe-zone area around your boat. The object is also labeled
as dangerous on the screen. When the alarm is off, the
message banner and audible alarm are disabled, but the
object is still labeled as dangerous on the screen.
2
Select Range.
3
Select a distance for the safe-zone radius around your
vessel.
4
Select Time To.
5
Select a time at which the alarm will sound if a target is
determined to intersect the safe zone.
For example, to be notified of a pending intersection 10
minutes before it will likely occur, set Time To to 10, and the
alarm will sound 10 minutes before the vessel intersects the
safe zone.
AIS Distress Signals
Self-contained AIS distress signal devices transmit emergency
position reports when activated. The chartplotter can receive
signals from Search and Rescue Transmitters (SART),
Emergency Position Indicating Radio Beacons (EPIRB), and
other man overboard signals. Distress signal transmissions are
different than standard AIS transmissions, so they appear
differently on the chartplotter. Instead of tracking a distress
signal transmission for collision avoidance, you track a distress
signal transmission to locate and assist a vessel or person.
Navigating to a Distress Signal Transmission
When you receive a distress signal transmission, a distress
signal alarm appears.
Select Review > Go To to begin navigation to the
transmission.
AIS Distress Signal Device Targeting Symbols
Symbol Description
AIS distress signal device transmission. Select to see more
information about the transmission and begin navigation.
Transmission lost.
Transmission test. Appears when a vessel initiates a test of
their distress signal device, and does not represent a true
emergency.
Transmission test lost.
Enabling AIS Transmission Test Alerts
To avoid a large number of test alerts and symbols in crowded
areas such as marinas, you can select to receive or ignore AIS
test messages. To test an AIS emergency device, you must
enable the chartplotter to receive test alerts.
1
Select Settings > Alarms > AIS.
2
Select an option:
• To receive or ignore Emergency Position Indicating Radio
Beacon (EPRIB) test signals, select AIS-EPIRB Test.
• To receive or ignore Man Overboard (MOB) test signals,
select AIS-MOB Test.
5
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