3. AIS OPERATION
3-9
5. Click the setting value then enter ROT with the setting knob (setting range: 0.1 to
720.0 (deg/min)).
6. Click outside the menu window to close the menu.
3.9
CPA/TCPA Alarm
The AIS continuously monitors the predicted range at the Closest Point of Approach
(CPA) and predicted time to CPA (TCPA) of each AIS target. When the predicted CPA
of an AIS target becomes smaller than a preset CPA range and its predicted TCPA
less than a preset TCPA limit, the audio alarm sounds. In addition, the symbol of the
offending AIS target is red and flashes together with its vector.
CPA/TCPA alarm ranges must be set up properly taking into consideration the size,
tonnage, speed, turning performance and other characteristics of own ship.
The reference point for CPA, TCPA calculation may be selected from antenna position
or conning position.
To set this alarm, see section 2.12 "CPA/TCPA Alarm".
3.10
Automatic Target Activation
You can get automatic activation of a sleeping AIS target when its CPA is within the
CPA/TCPA alarm setting. Further, you can select which AIS targets to automatically
activate.
1. Right-click the [AIS] icon to show the [AIS TARGET MENU] window.
2. Click [CPA AUTO ACTIVATE].
Ship turning to
starboard
[AIS TARGET MENU]
1 BACK
2
SLEEP ALL TARGETS
NO/YES
3
ACTIVATE ALL TARGETS
NO/YES
4
ACTIVATE ALL TARGETS
NO/YES
5 [AIS
DISP
FILTER]
6
[CPA AUTO ACTIVATE]
7
[AIS LOST FILTER]
