Chapter 6 RA83/84/85/93/94/95 Series
Using The Menu
Operation Manual
6.6.2 CPA and TCPA
The definition of CPA and TCPA is shown in the Figure 6.3.
Closest point
to own ship
CPA
TCPA
Target ship
Vector
Figure 6.4 Definition of CPA and TCPA
6.6.3 EPA plotting on the screen
The EPA data is displayed for 10 minutes on the screen. Up to 5 plots are available.
When the 6
th
plot is entered, plot 1 will be deleted automatically.
6.6.4 Alarm display
When 10 minutes has elapsed since a target has been plotted on the screen, the
system judges that the reliability of the plot data is lost, and accordingly turns the
audio alarm on together with the screen message “UNRELIABLE PLOT DATA” and
the blinking symbol shown. Responding to the audible alarm and the screen
message, you must update the plot. If you leave the plotted data without updating for
15 minutes, all symbols and the data currently plotted on the screen will be
automatically deleted.
Figure 6.5 Plotting sequence
Vector
Deleted plot
Plot 1
Plot 2
Plot 3
Plot 4
Plot 5
Current target
6-24
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