Furuno FR-2105 Operator's Manual page 91

ARPA symbols
The symbols used in this equipment comply with
Item Symbol
Automatically
acquired
targets
(flashing)
(flashing)
Manually
acquired
targets
(flashing)
(flashing)
guard zone
alarm
(flashing)
automatic
acquisition
area
Target selected
for data
readout
Status
Initial stage
epvs symbol no. 3
epvs symbol no. 3
Steady tracking
epvs symbol no. 4a
CPA alarm
epvs symbol no. 8
CPA alarm
acknowledge
epvs symbol no. 8
Lost target
epvs symbol no. 9
Initial stage
epvs symbol no. 3
epvs symbol no. 3
Steady tracking
epvs symbol no. 4a
CPA alarm
(collision course)
epvs symbol no. 8
epvs symbol no. 8
Lost target
epvs symbol no. 9
On target passing
through
operator-set guard
zone
epvs symbol no. 7
5.5 - 6.0 nm, 3 -
3.5 nm or
anywhere
epvs symbol no. 2
On selected target
1
epvs symbol no. 12
IEC 60872-1.
Remarks
Broken square around an echo to
indicate the target under acquisition and
initial stage of tracking, before
steady-state tracking.
Between 20 and 60 scans of antenna
after acquisition (vector still unreliable)
Solid circle with vector indicating steady
state tracking (60 scans after acquisition)
Plot symbol changes to an equilateral
triangle flashing to indicate the target is
predicted to come into CPA or TCPA.
Flashing stops after CPA/TCPA alarm is
acknowledged.
Lost target is indicated by flashing
diamond symbol. The diamond is formed
from two equal triangles.
Plot symbol selected for a target
acquired manually is shown in bold
broken lines.
Bold broken square for 20 - 60 scans of
antenna after acquisition
Manual plot symbol in a bold solid circle
(60 scans after acquisition)
Plot symbol changes to an equilateral
triangle flashing if a target is predicted to
come into the preset CPA or TCPA.
Flashing stops after CPA/TCPA alarm is
acknowledged.
Lost target is indicated by flashing
diamond symbol. The diamond is formed
from two equal triangles (one apex up
and the other apex down).
Plot symbol changes to an equilateral
triangle, apex down, flashing together
with vector if target entering guard zone.
Sector or full circle as selected by the
operator.
Target data (range, bearing, course,
speed, CPA and TCPA)
- 2 .
12-