21. AIS Target Functions
21-6
The right illustration shows AIS targets with "Outlines" and the left illustration shows AIS targets with "point
symbols". AIS targets are displayed as true scale symbol if the displayed chart scale is larger than set with
"Outlines" limit (length>7,5 mm) on the Tracking page in the Symbol Display dialog box and your own ship are
displayed as true symbol scale if the size of the true scale symbol is larger than 6 mm on the chart display.
21.5 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 red as long as you acknowledge
the "AIS dangerous target" alert. Then the target symbol is displayed in red color.
You can enable or disable the audio alert for dangerous targets. See section 21.7 "Danger Alarm for Dangerous AIS
Targets".
You can set CPA and TCPA limits used by the ECDIS, 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 time for CPA.
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