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AIS RECEIVER
AIS operation
D About Lost targets
After a specied period of time (see the table below) has elapsed since the last AIS was received from a vessel, it
is considered a Lost Target.
The “Lost target” icon automatically disappears from the screen 6 minutes and 40 seconds after the vessel
becomes “Lost target.”
Reference time to become a Lost target
• Class A/B
Vessel type
Nominal
reporting
interval Class A
Lost target
maximum
interval Class A
Nominal reporting
interval Class B *
1
Lost target maximum
interval Class B *
1
CS *
2
SO *
3
CS *
2
SO *
3
1
Class A
Vessel is at anchor or moored and
not moving faster than 3 knots
3 min. 18 min. — — — —
Class B
Vessel is
not moving faster than 2
knots
— — 3 min. 3 min. 18 min. 18 min.
2
Vessel is at anchor or moored and moving
faster than 3 knot
10 sec. 60 sec. N/A N/A
3
Class A
Vessel is moving between 0 and
14 knots
10 sec. 60 sec. — — — —
Class B
Vessel is moving between 2 and
14 knots
— — 30 sec. 30 sec. 180 sec. 180 sec.
4
Class A
Vessel is moving between 0 and
14 knots while changing course
3
1
⁄
3
sec.
60 sec.
— — — —
Class B
Vessel is moving between 2 and
14 knots while changing course
— — 30 sec. 30 sec. 180 sec. 180 sec.
5 Vessel is moving between 14 and 23 knots 6 sec. 36 sec. 30 sec. 15 sec. 180 sec. 90 sec.
6
Vessel is moving between 14 and 23 knots
while changing course
2 sec. 36 sec. 30 sec. 15 sec. 180 sec. 90 sec.
7 Vessel is moving faster than 23 knots 2 sec. 30 sec. 30 sec. 5 sec. 180 sec. 30 sec.
8
Vessel is moving faster than 23 knots while
changing course
2 sec. 30 sec. 30 sec. 5 sec. 180 sec. 30 sec.
*1 AIS Class B does not provide information about the navigation status, anchored or moored.
*2 CS: Carrier-sense, *3 SO: Self organized
• Others
Category
Nominal reporting
interval
Lost target
maximum interval
SAR aircraft 10 sec. 60 sec.
Base station 10 sec. 60 sec.
AtoN 3 min. 18 min.
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