4. AIS OPERATION
4-2
*: Includes AIS-SART, AIS MOB and EPRIB-AIS.
If a new AIS object is received after reaching the processing or display capacity, this
radar processes the object as follows:
• AIS targets: When reaching the processing capacity, a new AIS is ignored. When
reaching the display capacity, this radar displays a maximum number of AIS objects
nearest to the own ship
• AIS data report/AIS locating device/AIS synthetic target: When reaching the pro-
cessing or display capacity, a new AIS is ignored.
The frequency for update of AIS transponder-sent data depends on speed and course
of tracked AIS object. The table below shows the IMO standardized reporting rates for
the AIS transponder. Based on the table below, the radar defines which AIS objects
are in tracking or lost. When you acknowledge a lost alert, the corresponding AIS sym-
bol will be removed from the display.
AIS locating device
AIS SART* (active)
20
--
AIS SART* (test) - -
AIS synthetic target
AIS synthetic target 50 - -
Type of Ship
IMO
nominal
reporting
interval
Lost object
indication
(reporting
interval >)
Class A: Navigation status is “anchor” or “not under
command” or “moored” or “aground”, and SOG ≤
3kn
3 min 10 min
Class A: Navigation status is “anchor” or “not under
command” or “moored” or “aground”, and SOG > 3kn
10 s 50 s
Class A: 0kn ≤
SOG < 14kn 10 s 50 s
Class A: 14kn ≤
SOG ≤ 23kn 6 s 30 s
Class A: SOG > 23kn 2 s 10 s
Class B: “CS” SOG ≤ 2kn 3 min 10 min
Class B: “CS” SOG > 2kn 30 s 150 s
Class B: “SO” 0 kn ≤
SOG ≤ 2kn 3 min 10 min
Class B: “SO” 2 kn < SOG < 14kn 30 s 150 s
Class B: “SO” 14 kn ≤ SOG ≤ 23kn 15 s 75 s
Class B: “SO” SOG > 23kn 5 s 25 s
Class A and Class B: no SOG available N/A 10 min
AIS SAR aircraft 10 s 1 min
AIS aid to navigation 3 min 18 min
AIS base station 10 s 1 min
AIS search and rescue transponder N/A 6 min
AIS synthetic target N/A 18 min
AIS object type
Display
capacity
Alert when reaching
95% of display
capacity
100% of display
capacity
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