Simrad NSO, Руководство по эксплуатации

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Other vessels on chart and radar image | 43
7 Other vessels on chart and radar image
If the NSO includes a heading sensor, the MARPA function (Mini Automatic Radar Plotting
Aid) can be used to track radar targets.
If an AIS device is connected, any targets detected by this devises can be displayed and
tracked. You can also see messages and position for DSC transmitting devices within
range.
AIS targets can be displayed as overlay on radar and chart images, and both features
are important tools for safe travelling and collision avoidance.
You can define alarms to notify you if a target gets too close or if the target is lost.
AIS vessels on a chart panel AIS vessels on a radar panel
Target symbols
The NSO system use the target symbols shown below:
Symbol Description
Sleeping AIS target (not moving or at anchor).
Moving and safe AIS target with course extension line.
Acquiring MARPA target. Typically it takes up to 10 full rotations of
scanner
Tracking MARPA target, not moving or at anchor.
Tracking and safe MARPA target with extension lines.
Dangerous AIS target,
illustrated with bold line.
based on the CPA, TCPA and AIS
Range settings. Refer
later in this
section.
Dangerous MARPA target
Lost AIS target.
When no signals have been
received within a time limit a
>*;
The target symbol represents
the last valid position of the
target before the reception of
data was lost.
Lost MARPA target
Selected AIS target, activated
by positioning the cursor over a
target symbol.
The target will return to default
target symbol when the cursor
is moved.
Selected MARPA target