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Lost Target Alarm
When it is impossible to continue tracking any acquired and tracked target, or the data of AIS target cannot
received for a specified time, the LOST alarm will be generated. The typical causes for alarm generation are
shown below, but not limited to the following:
x The target echo is very weak.
x The target is shadowed by a shore or a large ship and its echo is not received.
x The target echo is blurred by sea clutter returns.
If a target under tracking goes into a range of 32 nm and can no longer be tracked, it is canceled without a lost
target alarm being issued.
Lost Target Alarm
Status Symbol on display Alarm characters Alarm sound Conditions
Lost target
Red Blinking
Lost
Beep sound (pee)
Alarm
acknowledgeable
The alarm will sound once
when a lost target symbol is
displayed.
The AIS symbol blinks for x only.
12
AIS12
z If the gain, sea clutter suppression, rain/snow clutter
suppression are not adjusted adequately, the lost
target alarm may be easily generated. So such
adjustments should be mad carefully.
Attention
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