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2
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12-
ARPA symbols
The symbols used in this equipment comply with
IEC 60872-1.
Item Symbol Status Remarks
Automatically
acquired
targets
Initial stage
epvs symbol no. 3
Broken square around an echo to
indicate the target under acquisition and
initial stage of tracking, before
steady-state tracking.
epvs symbol no. 3
Between 20 and 60 scans of antenna
after acquisition (vector still unreliable)
Steady tracking
epvs symbol no. 4a
Solid circle with vector indicating steady
state tracking (60 scans after acquisition)
(flashing)
CPA alarm
epvs symbol no. 8
Plot symbol changes to an equilateral
triangle flashing to indicate the target is
predicted to come into CPA or TCPA.
CPA alarm
acknowledge
epvs symbol no. 8
Flashing stops after CPA/TCPA alarm is
acknowledged.
(flashing)
Lost target
epvs symbol no. 9
Lost target is indicated by flashing
diamond symbol. The diamond is formed
from two equal triangles.
Manually
acquired
targets
Initial stage
epvs symbol no. 3
Plot symbol selected for a target
acquired manually is shown in bold
broken lines.
epvs symbol no. 3
Bold broken square for 20 - 60 scans of
antenna after acquisition
Steady tracking
epvs symbol no. 4a
Manual plot symbol in a bold solid circle
(60 scans after acquisition)
(flashing)
CPA alarm
(collision course)
epvs symbol no. 8
Plot symbol changes to an equilateral
triangle flashing if a target is predicted to
come into the preset CPA or TCPA.
epvs symbol no. 8
Flashing stops after CPA/TCPA alarm is
acknowledged.
(flashing)
Lost target
epvs symbol no. 9
Lost target is indicated by flashing
diamond symbol. The diamond is formed
from two equal triangles (one apex up
and the other apex down).
guard zone
alarm
(flashing)
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.
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
1
On selected target
epvs symbol no. 12
Target data (range, bearing, course,
speed, CPA and TCPA)