Operation Manual

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A-36
APPENDI
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1-12. AIS Lost Target
When a dangerous AIS target is lost, the lost target alarm will be activated and the dangerous
target symbol will change to a lost symbol. And the present target position is predicted by the
final received data from the target and the lost symbol position will be updated for approx. 1
minute. The lost symbol would be deleted when “ALARM ACK” key is pressed or no data has
been received for approx. 1 minute after activating a lost target alarm.
LOST TARGET interval depends on the Class A or Class B and the category of ship. Please see
the following the lost target interval for Class A and Class B ship.
【SOLAS ships】（Class A）
Category of Ship Lost target Interval
Ship at anchor or moored and moving at less than 3 knots 18 min
Ship at anchor or moored and moving at more than 3 knots 60 sec
Ship 0 to 14 knots 60 sec
Ship 0 - 14 knots and changing course 60 sec
Ship 14 - 23 knots 36 sec
Ship 14 – 23 knots and changing course 36 sec
Ship > 23 knots 12 sec
Ship > 23 knots and changing course 12 sec
【Non SOLAS ships】（Class B）
Category of Ship Lost target Interval
Ship < 2 knots 18 min
Ship 2 – 14 knots 180 sec
Ship 14 – 23 knots 90 sec
Ship > 23 knots 30 sec
NOTE:
When non dangerous target is lost, the target symbol will be fixed at the last reported position and
deleted automatically after waiting for the data input from the target for above lost target interval.