JRC JMR-9210-6X - Lost Target Notification (Lost)

6-59 Section 6 Target Tracking and AIS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Alarm for New Target Acquired in Automatic Acquisition Guard Zone
Status
Symbol on
display
Alert
characters
Alarm sound Conditions
New target in
automatic
acquisition
guard zone
Red Blinkin
g
New
Target
Beep sound
(beep-beep)
Alarm
acknowledgeable
The alarm is issued when a
new target is acquired in the
automatic acquisition guard
zone.
Note
When an already acquired target goes into automatic acquisition guard zone, the alarm for the
new target acquired in automatic acquisition guard zone does not sound.
6.7.3 Lost target notification (Lost)
Note
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 canceled
without a lost target notification being issued.
Lost Target Notification
Status
Symbol on
display
Alert
characters
Alarm sound Conditions
Lost target
Red Blinkin
g
Lost
Beep sound
(beep-beep)
notification
acknowledgeable
The notification will sound
once when a lost target
symbol is displayed.
AIS12
12
12