Furuno FCR-2107 series - TT Symbols and TT Symbol Attributes

4. Tracked Target (TT) Operation
4-7
4.7 TT Symbols and TT Symbol Attributes
4.7.1 TT symbols
The symbols used in this equipment comply with IEC 62388.
Item Symbol Status Remarks
Initial stage Broken circle around an echo to indicate the target
under acquisition and initial stage of tracking,
before steady-state tracking.
Within one minute after acquisition (vector still
unreliable).
Steady tracking Solid circle with vector indicating steady state
tracking (within three minutes after acquisition).
(flashing)
CPA alarm Plotting symbol (red) flashes to indicate the target is
predicted to come into CPA or TCPA.
CPA alarm acknowledge Shown in red, and flashing stops after CPA/TCPA
alarm is acknowledged.
Automatically
acquired targets
(flashing)
Lost target A red X is crossed through the TT symbol to
indicate that it is a lost target. Flashing stops after
lost target alarm is acknowledged.
Initial stage Plotting symbol selected for a target acquired
manually is shown in bold broken lines.
Within one minute after acquisition.
Steady tracking Manual plotting symbol in a bold solid circle
(within three minutes after acquisition).
(flashing)
CPA alarm
(collision course)
Plotting symbol (red) flashes to indicate the target is
predicted to come into CPA or TCPA.
Flashing stops after CPA/TCPA alarm is
acknowledged.
Manually
acquired targets
(the width of the
line for "steady
tracking" TT is
thicker than that of
the automatically
acquired target)
(flashing)
Lost target A red X is superimposed on the TT symbol to
indicate a lost target. Flashing stops after lost target
alarm is acknowledged. See the next page for lost
target criteria.
Acquisition zone
(flashing)
On target passing
through operator-set
acquisition zone
Symbol is red and flashing.
Target selected
for data readout
On selected target Target data (range, bearing, course, speed, CPA and
TCPA).
Reference target
R
After three
minutes, changes
to ○R
On reference target Used to calculate own ship’s over-the-ground speed
(echo-referenced speed) for ground stabilization.
Trial maneuver T
(flashing)
Bottom center
Appears during execution of a trial maneuver.
Performance test
S
(flashing)
Bottom center Appears during performance test.