Furuno NavNet TZtouch3 Series Operator's Manual page 208

6. RADAR
6.28.10 CPA graphic display
The CPA graphic display shows the CPA between own vessel and the selected ARPA
(or AIS) target with a line, called the "CPA line." Whenever you change your vessel's
course and speed, you can see the new CPA between your vessel and the selected
ARPA target.
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 a ARPA target on the radar or
plotter display, tap the ARPA target. The CPA
line connects between your vessel and the CPA
of the ARPA target. The color of the line is the
same as that of the target symbol. To find the
CPA of another ARPA target, select it, and the
CPA line moves to the newly selected target.
(Only only line can be displayed at a time.) The
example at right 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
symbol of the selected target 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 tapping the CPA line (or
own ship icon* or target) to show the pop-up menu, then select [CPA].
* Plotter display only
• The feature is turned off.
• The TCPA is a minus (-) value.
• The target is a lost target.
• The CPA and TCPA of the target cannot be calculated (no speed or heading data
for own ship).
6-40
Own ship
ARPA target
5
CPA line