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2-9
ARPA symbols (continued)
Item Symbol Status Remarks
Guard zone On target passing
through operator-
set guard zone
EPVS symbol NO. 7
Plot symbol changes to an equilateral
triangle apex down, flashing together
with vector if target entering guard
zone (guard ring).
Automatic
acquisition area
5.5-6.0 nm, 3-3.5
nm or anywhere
EPVS symbol NO. 2
Sector or full circle as selected by the
operator.
Target selected
for data readout
Target data (range, bearing, course,
speed, CPA and TCPA).
Reference target Used to calculate own ship’s over-
the-ground speed (target-based speed)
for ground stabilization.
Trial maneuver
T
Bottom center
EPVS symbol NO. 10
Appears during execution of a trial
maneuver.
(flashing)
Auto Plotter
performance
test
XX
Bottom center
EPVS symbol NO. 11A
Appears during execution of a
performance test (Track Test).
On selected
target
EPVS symbol NO. 12
1
On reference
target
R
(In 60 scans,
change to
)
R
(flashing)
(flashing)
Item Symbol Status Remarks
Non-ARPA
symbols
These are non-ARPA symbols but only
for E-prot. Not available in the ARPA
mode.