1-12. Ais Lost Target - JRC JMA-9922-6XA Instruction Manual

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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）
Ship at anchor or moored and moving at less than 3 knots
Ship at anchor or moored and moving at more than 3 knots
Ship 0 to 14 knots
Ship 0 - 14 knots and changing course
Ship 14 - 23 knots
Ship 14 – 23 knots and changing course
Ship > 23 knots
Ship > 23 knots and changing course
【Non SOLAS ships】 （Class B）
Ship < 2 knots
Ship 2 – 14 knots
Ship 14 – 23 knots
Ship > 23 knots
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.
Category of Ship
Category of Ship
A-36
Lost target Interval
18 min
60 sec
60 sec
60 sec
36 sec
36 sec
12 sec
12 sec
Lost target Interval
18 min
180 sec
90 sec
30 sec