Arp Symbols And Arp Symbol Attributes; Arp Symbols - Furuno FAR21x7 & BB FAR28x7 Operator's Manual BB FAR28x7 Operator's Manual

3.7

ARP Symbols and ARP Symbol Attributes

3.7.1

ARP symbols

The symbols used in this equipment comply with IEC 60872-1.
Item Symbol
Automatically
acquired targets
(flashing)
(flashing)
Manually
acquired targets
(flashing)
(flashing)
Guard zone
(flashing)
Target selected
for data readout
Reference target
In 60 scans,
changes to
○
Status
Initial stage
Steady tracking
CPA alarm
CPA alarm
acknowledge
Lost target
Initial stage
Steady tracking
CPA alarm
(collision course)
Lost target
On target passing
through operator-set
guard zone
On selected target
01
On reference target Used to calculate own ship's
R
R
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 the antenna
after acquisition (vector still unreliable)
Solid circle with vector indicating steady
state tracking (60 scans after acquisition)
Plotting 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. Flashing stops
after lost target alarm is acknowledged.
Plotting symbol selected for a target
acquired manually is shown in bold broken
lines.
Bold broken square for 20 - 60 scans (3
scans for HSC) of the antenna after
acquisition
Manual plotting symbol in a bold solid
circle (60 scans after acquisition)
Plotting 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. Flashing stops
after lost target alarm is acknowledged.
Plotting symbol changes to an equilateral
triangle, apex down, flashing together with
vector if target enters guard zone.
Target data (range, bearing, course,
speed, CPA and TCPA)
over-the-ground speed (echo-referenced
speed) for ground stabilization.
3. ARP OPERATION
3-9