3. TARGET TRACKING (TT)
3-18
3.12.3 How to acknowledge the TT CPA/TCPA alarm
When the CPA or TCPA of a target is within the CPA and TCPA limits, the Alert 526
(ALF format: 191,1) "TT CPA/TCPA" appears in the [Alert] box and the audio alarm
sounds. To acknowledge the alarm and silence the buzzer, push the ALARM ACK
key on the Control Unit, or click the alert indication in the [Alert] box.
The alert in the [Alert] box and the flashing of the plotting symbol and vector continue
until you intentionally terminate tracking of the target or the dangerous situation is
gone.
3.13 TT Lost Target Alert
Tracked targets not detected in five consecutive scans become "lost targets." When
this occurs;
• A red X is put on the TT symbol (flashing) of the lost target. (The flashing stops after
the lost target alarm is acknowledged.)
• The audio alert sounds and the Alert 527 (ALF format: 193,1) "TT Lost" appears in
the [Alert] box.
3.13.1 How to enable, disable the TT lost target alert
The [Lost TGT] indication at the bottom-right position enables, disables the lost target
alert. Click the indication to select [OFF], [ALL] or [FILT] as appropriate.
[OFF]: Disable the alert.
[FILT]: Get the alert against the targets whose criteria meet the settings made in
section 3.13.2.
[ALL]: Get the alert against all lost targets.
Note: The [Lost TGT] setting is shared commonly between TT and AIS.
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