12. AIS, DSC MESSAGE
12-9
12.14 CPA Graphic Display
The CPA graphic display, which requires own position and heading data, draws a line
between own ship position and the selected AIS target. This feature lets you monitor
an AIS target’s heading and speed changes. The display is useful as an anti-collision
aid, especially in congested waters.
To activate or deactivate the CPA graphic display, open the [Targets] menu and turn
[CPA Graphic Display] on or off.
To find the CPA of an AIS target on the radar or plotter display, tap the AIS target. The
CPA line connects with the position of your vessel and the CPA of the AIS target, and
its color is the same as the color of the target symbol. The example belows the ap-
pearance on the plotter display.
If the CPA/TCPA alarm is generated while the CPA line is in use, the CPA line and the
selected target symbol turn red.
The CPA graphic display feature is not available in the following conditions:
• The CPA line is turned off. The line can be turned off by tapping the CPA line (or
own ship icon* or target) to show the pop-up menu, then select [CPA].
* Plotter display only
• The TCPA is a minus (-) value.
• The target is a lost target.
• The speed and heading data from the AIS target are lost.
• The CPA and TCPA of the target cannot be calculated (no speed or heading data
for own ship).
• No own ship speed or heading.
CPA graphic
(line)
Own ship
Class A
IS target
000000001
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