14. AIS, DSC MESSAGE
14-9
14.13 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 to help you monitor an AIS tar-
get’s heading and speed changes. The display is useful as an anti-collision aid, espe-
cially in congested waters.
To activate or deactivate the CPA graphic display, open the [Targets] menu, then turn
on [CPA Graphic Display].
To find the CPA of an AIS target on the radar or chart plotter display, tap the AIS tar-
get. 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 AIS target’s symbol. The example
below shows the appearance of the graphic display on the chart plotter display.
If the CPA/TCPA alarm is generated while the CPA line is in use, the CPA line and the
selected target’s symbol turn red.
The CPA graphic display is deactivated (erased) 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].
* Chart plotter display only
• The TCPA is a minus (-) value.
• The AIS target is a lost target.
• The speed and heading data from the AIS target are lost.
• The CPA and TCPA of the AIS target cannot be calculated because speed and
heading data become lost.
• No own ship speed or heading.
CPA line
Own ship
Class A
AIS target
FURUNO
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