Sperry Marine VISIONMASTER FT ECDIS-E, User Manual

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ECDIS-E User Guide Targets
65934012 9-39
Target Association
Target association enables the system to decide if a target tracked or
activated on one node is the same as a target tracked or activated on other
nodes.
The difference in the target's range, bearing and velocity values must be
less than the association limits for a target to be considered the same. If
targets do associate then they will be shown with the same ID on all nodes.
If targets change course, such that any of the values becomes greater than
the limits, the target association will split and each target will then have a
unique ID.
There are two defined settings for target association: Standard and Loose.
The default values for Standard and Loose settings and the
minimum/maximum limits for Target Association are shown in the table
below.
Target Association
Parameter Distance Angle Speed
Standard Setting 0.06 NM 1.0° 5.0 kn
Loose Setting 0.18 NM 2.0° 5.0 kn
Range of values
0.01 NM to 0.18
NM
0.1° to 3.6° 1.5 kn to 10 kn
If target association settings are changed the settings defined in the table
above may be re-applied by ticking the
Standard Setting or Loose
Setting check boxes.
Note that setting these values too high may result in targets which are
separate being considered the same target; whilst setting the values too
low may mean that targets that are the same are not correlated, leading to
multiple targets being displayed in the same position.
Lost Target Alerts
This area enables Lost Target alerts to be raised on all nodes and a lost
target alert range limit set, so that any lost targets within a specified
maximum limit from own ship will raise an alert. For a description of Lost
Targets and the symbology used, see Target Monitoring.
The default maximum range limit distance is 10 NM. The
minimum/maximum values are 0.1 NM to 100 NM.