Cpa Graphic Display - Furuno TZT9 Operator's Manual

13.11 CPA Graphic Display

The CPA graphic display shows the CPA between own vessel and the selected AIS
target with a line, called the "CPA line." You can use the line to monitor speed and
heading changes of another vessel, which makes it useful as an anti-collision aid, es-
pecially in congested waters. (Requires own ship and position data.)
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. The
line is the same color as the target symbol. To find the CPA of another AIS target se-
lect it, and the CPA line moves to the newly selected target. (Only only line can be dis-
played at a time between AIS and ARPA targets.) The example below shows the
appearance of the CPA line on the radar 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 is not available in the following conditions:
• The CPA line is turned off. The line can be turned off by selecting the CPA line (or
own ship icon), then selecting [Hide CPA line] from the pop-up menu.
• The feature is turned off.
• 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.
Own ship
Class A
AIS target
000000001
13. AUTOMATIC IDENTIFICATION SYSTEM (AIS)
CPA line
13-9