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Table 5.2 Definitions of Symbols
Vector/Symbol Definition Remarks
Tracked target
Dangerous target
(CPA/TCPA)
Alarm characters (CPA/TCPA) appear and
an alarm sounds.
The vector and symbol blinks.
Initial acquisition mark Displayed after a target is acquired until
its vector is displayed.
Target with its data indicated When designating a target’s data indication
with the trackball, the target’s symbol is
changed into and the target’s ID is
indicated. However, in case of a lost target or
a dangerous target, its corresponding symbol
is displayed instead of .
Lost target (This symbol
appears when a target can not
be tracked for any reason)
Alarm characters (LOST) appear and an
alarm sounds. No vector is displayed, but
the symbol blinks.
Target that has intruded into the
guard zone
Alarm characters (GZ) appear and an
alarm sounds. The symbol blinks.
Trackball cross cursor mark
This mark is used to designate a target
when acquiring manually and cancelling it
and indicating its numerical data.
A target’s past positions The symbol and vector is displayed only
when [PAST POSN] is ON. The position
interval can be set to 0.5, 1, 2 or 4 min.
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