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-1.31-
[EPA]
1 VECTOR TIME 30SEC/1/2/3/6/12/15/30 MIN
2 COLLISION ALARM OFF/ON
CPA x.x NM*
TCPA xx.x MIN*
3 MARK STD/LARGE
4 PLOT NO. OFF/ON
*: Setting range
CPA: 0.0 to 9.9 NM
TCPA: 1.0 to 99.9 MIN
2. Press the [ENTER] key to confirm your selection.
3. Press the PLOT MENU key to close the menu. The vector tip shows an estimated position
of the target after the selected vector time elapses. It can be valuable to extend the vector
length to evaluate the risk of collision with any target.
Target data
The radar calculates motion trends (range, bearing, course, speed, CPA and TCPA) of all
plotted targets.
In head-up and head-up true bearing modes, target bearing, course and speed shown in the
upper-right target data field become true (T) relative to north or relative (R) relative to own
ship in accordance with true/relative vector setting. In north-up, course-up, and True Motion
modes, the target data field always displays true bearing, true course and speed over the
ground.
Reading the target data
Press the ACQ key and corresponding numeric key, and the following target data is displayed.
RNG/BRG (Range/Bearing): Range and bearing from own ship to last-plotted target with
suffix "T" (True) or "R" (Relative) plot symbol.
CSE/SPD (Course/Speed): Course and speed are displayed for the last-plotted target with
suffix "T" (True) or :"R" (Relative) plot symbol.
CPA/TCPA: CPA (Closest Point of Approach) is a closest range the target will approach to
own ship. TCPA is the Time to CPA. Both CPA and TCPA are automatically calculated.
TCPA is counted up to 99.9 min and beyond this, it is indicated as TCPA > *99.9 MIN.
BCR/BCT: BCR (Bow Cross Range) is the range at which target will cross own ship's bow.
BCT (Bow Cross Time) is the estimated time at which target will cross own ship's bow. If
BCR is negative, BCR/BCT readout should be displayed as *.*.
Terminating target plotting
With EPA you can plot up to 10 targets. You may wish to terminate plotting of less important
targets to newly plot other threatening targets.
By Symbol: To terminate plotting of a certain target, press the TARGET CANCEL key and
then press the corresponding plot number key.
With Trackball: Place the cursor (+) on a target which you do not want to be tracked any
longer by operating the trackball and press the TARGET CANCEL key.
All Targets: To terminate plotting of all targets at once, press and hold the TARGET