User's Manual

Table Of Contents
NACOS Platinum
ED 3100 G 110 / 02 (2011-10)
Operating Instructions
A-7 Target Handling
A RADAR.fm / 10.11.11
A-62
7.5 Settings for Dangerous Targets
Dangerous Targets On
With this function activated, targets tracked by the ARPA and also AIS
targets can automatically be marked as dangerous targets by the auto-
matic collision avoidance computation if their CPA/TCPA data fall short of
the limits set in the Limits group. As a result,
- the Dangerous Target alarm appears,
- the target which has caused the alarm is indicated on the PPI by
means of the flashing symbol or ; if a sleeping AIS
target has caused the alarm, that target is automatically activated
beforehand. The flashing of the symbol stops after the alarm Dangerous Target for the appro-
priate target has been acknowledged. The alarm is kept in the alarm list as long as one dangerous
target is present.
Auto Acquire AIS Targets
In particular cases, it might be required to prevent AIS targets from being acquired by the collision avoid-
ance computation, for example to avoid unnecessary alarms in port or at other berths caused by too
many AIS targets. In this case the checkbox AUTO ACQ AIS Targets must be cleared.
As long as AUTO ACQ AIS Targets is activated, even sleeping targets not being selected for display
are reckognized as Dangerous targets automatically. See chapter 3.5.2 on page III-60 for details.
Limits-CPA
The limit for the distance to the closest point of approach of a target can be set here.
If a target gets closer then the set limit, it is automatically marked as dangerous
target and the alarm Dangerous Target is raised.
Limits TCPA
The limit for the time to closest point of approach of a target can be set here. If the TCPA of a target
gets shorter then the set limit, it is automatically marked as dangerous target and the alarm Dangerous
Target is raised.