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Radar | NSO-II Operator Manual
MARPA targets
If the NSO-II includes a heading sensor, the MARPA function (Mini Automatic Radar
Plotting Aid) can be used to track up to tem radar targets.
You can dene alarms to notify you if a target gets too close. Refer “MARPA target settings”
on page 52.
MARPA tracking is an important tool for collision avoidance.
¼ Note: MARPA requires heading data for both the radar and the NSO-II .
MARPA target symbols
The NSO-II 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 dened as dangerous based on the CPA, TCPA and AIS Range
settings. Refer “Vessel alarm settings” on page 53.
When no signals have been received within a time limit a target will be dened
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 identied, 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 Vessels window under Tools pages to view information about targets.
MARPA target settings
Several vessel settings dene alarm limits and how the targets are displayed on your radar
image.
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