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5. AIS Operation
5-11
5.9 How to Set CPA and TCPA Limits
A dangerous AIS target is one whose CPA and TCPA are within the range of the CPA and TCPA limits set in the
information area. A dangerous AIS target is displayed as a blinking target symbol in green and red alternately as
long as you acknowledge the "AIS dangerous target" alert. Then the target symbol is displayed in red color.
You can activate or deactivate the audio alarm for dangerous targets.
5.9.1 How to set CPA and TCPA limits
You can set CPA and TCPA limits, in the information area.
1. Put the cursor on the text "CPA OFF" then left-click to get the distance and time fields.
2. Put the cursor on the distance value and use the scrollwheel to set distance for CPA.
3. Put the cursor on the time value and use the scrollwheel to set the TCPA.
SINGLE
SINGLE
AUTO
MAN
AUTO
MAN
xx.xx xx.xx xx.xx xx.xx
5.9.2 How to activate, deactivate danger alarm for dangerous AIS targets
You can enable or disable the danger alarm (buzzer) for dangerous AIS targets as follows:
Set the cursor on the text "CPA" then right-click to get the Target alerts dialog box.
Check or uncheck Danger alarm in the AIS window as appropriate.