Section 6 Target Tracking and AIS 6-42
6.7.3 Lost target notification (Lost)
Memo
If the gain, sea clutter suppression, rain/snow clutter suppression are not adjusted adequately, the
lost target notification may be easily generated. So, such adjustments should be very carefully.
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] notification will be issued. The typical causes for alarm
are shown below:
• The target echo is very weak.
• The target is hidden by a shore or a large ship and its echo is not received.
• The target echo is blurred by sea clutter or rain/snow clutter.
If a target under tracking goes into a range over 32 NM and can no longer be tracked, it is cancelled
without a lost target notification being issued.
Lost Target Notification
Status
Symbol on
display
Alert
characters
Alarm sound Conditions
Lost target
Lost
Beep sound
(beep-beep-beep)
notification
acknowledgeable
The notification will sound
once when a lost target
symbol is displayed.
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