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True or relative vector
True vectors can be displayed with refer-
ence to the north. Press the VECTOR
TRUE/REL key to select the proper indi-
cation. This feature is available in all pre-
sentation modes (gyrocompass must be
working correctly). The current vector
mode is indicated at the upper-right cor-
ner of the screen.
Vector time
Vector time (or the length of vectors) can
be set to 30 sec, 1, 2, 3, 6, 12, 15 or 30
minutes and the selected vector time is
indicated at the upper-right corner of the
screen. Press the VECTOR TIME key
until the desired vector time is reached.
The vector tip shows an estimated posi-
tion 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,
TCPA, BCR and BCT) of all plotted tar-
gets.
In head-up and head-up true bearing
modes, target bearing, course and speed
shown in the upper-right target data field
become true (suffix "TRU") or relative (suf-
fix "REL") to own ship in accordance with
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 corresponding plot symbol key,
and the following target data is displayed.
RNG/BRG (Range/Bearing): Range and
bearing from own ship to last-plotted tar-
get 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 "TRU" (True) or :"REL"
(Relative) plot symbol.
CPA/TCPA: CPA (Closest Point of Ap-
proach) is a closest range the target will
approach to own ship. TCPA is the Time
to CPA. Both CPA and TCPA are auto-
matically 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
readout should be displayed as *.*. (When
BCT is negative, BCT is x.x.)
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 cer-
tain target, press the corresponding plot
no. key. Then press the CANCEL 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 CANCEL key.
All Targets: To terminate plotting of all
targets at once, press and hold the CAN-
CEL key until all plot symbols and marks
disappear in about 3 seconds.
Entering own ship's speed
EPA requires an own ship speed input and
compass signal. The speed can be en-
tered from a speed log (automatic) or
through the plotting keypad (manual).