4. AIS OPERATION
4-14
4.10 Lost Target
A target is declared a lost target when it fails to produce data for six minutes or
five reporting intervals, whichever is the shorter. When this occurs, the target is
marked with the (flashing) lost target symbol and the indication “LOST” appears.
To acknowledge a lost target, press the [ALARM ACK] key or roll the trackball to
choose the ALARM ACK box and then push the left button.
Lost target
Note 1: If an ARPA lost target mark is displayed when the [ALARM ACK] key is
pressed (or the ALARM ACK box is clicked) to acknowledge an AIS lost
target, the ARPA lost target will also be erased.
Note 2: The AIS data transmission interval depends on target’s speed. For
example, the data is transmitted every 10 seconds on ship speed of 0
to 14 kt and every two seconds on the ship speed of more than 23 knots.
For details see the owner’s manual of the AIS.
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