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Using the radar | NSS Operator Manual
MARPA targets
If the NSS includes a heading sensor, the MARPA function (Mini Automatic Radar Plotting Aid)
can be used to track up to tem radar targets.
You can defi ne alarms to notify you if a target gets too close. Refer “MARPA target settings” on
page 47.
MARPA tracking is an important tool for collision avoidance.
Note: MARPA requires heading data for both the radar and the NSS .
MARPA target symbols
The NSS system use the target symbols shown below.
Symbol Description
Acquiring MARPA target. Typically it takes up to 10 full rotations of the scanner
Tracking MARPA target, not moving or at anchor.
Tracking and safe MARPA target with extension lines.
Dangerous MARPA target.
A target is defi ned as dangerous based on the CPA, TCPA and AIS Range
settings. Refer Vessel alarm settings on page 48.
When no signals have been received within a time limit a target will be defi ned
as lost.
The target symbol represents the last valid position of the target before the
reception of data was lost.
Selected MARPA target, activated by tapping on the target icon.
The target will return to default target symbol when the cursor is removed.
Tracking MARPA targets
1. Tap on the target on the radar panel
2. Select Acquire targets from the menu
3. Repeat process for more targets
Once your targets are identifi ed, it may take up to 10 radar sweeps to acquire and then track
the target.
Cancelling target tracking
When targets are being tracked, the radar menu will expand to include options for cancelling
individual targets or to stop the tracking function.
Cancel tracking individual targets by tapping the icon before activating the menu.
Viewing target information
Basic target information can be shown in the data bar.
You can also use the Tools pages to view information about targets. See page 79 .
MARPA target settings
Several vessel settings defi ne alarm limits and how the targets are displayed on your radar
image.
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