Ais Operation - Furuno FAR-1513-BB Operator's Manual

4.

AIS OPERATION

An AIS transponder can be connected to this radar to overlay AIS targets on the radar
display. The radar can store up to 1,000 AIS targets in its storage buffer. When this
buffer becomes full of AIS targets, the Alert 190 "TARGET CAPACITY (AIS CAPACI-
TY FULL)" is generated to inform you that the storage buffer is full. The storage buffer
contains automatic dead reckoning for all AIS targets, which is based on reported
Speed Over the Ground (SOG), Course Over the Ground (COG), Rate Of Turn (ROT)
and heading. The storage buffer also contains calculation of range, bearing, CPA, TC-
PA, etc. The CPA and TCPA limits set for dangerous targets are common for TT and
AIS targets.
This radar can activate 40 AIS targets. The Alert 190 "TARGET CAPACITY (ACTIVE
AIS FULL)" is generated when 40 AIS targets are activated.
This radar can display a maximum of 300 AIS targets. The Alert 190 "TARGET CA-
PACITY (AIS DISPLAY FULL)" is generated when 300 AIS targets, which includes
both activated and sleeping targets, are displayed.
The frequency for update of AIS transponder-sent data depends on speed and course
of tracked AIS target. The table below shows the IMO standardized reporting rates for
the AIS transponder. Based on the table below, the radar defines which AIS targets
are in tracking or lost. When you acknowledge a lost target alert, the corresponding
AIS symbol will be removed from the display.
Type of Ship
Class A: Navigation status is "anchor" or "not under
command" or "moored" or "aground", and SOG
Class A: Navigation status is "anchor" or "not under
command" or "moored" or "aground", and SOG > 3kn
Class A: 0kn SOG < 14kn
Class A: 14kn SOG
Class A: SOG > 23kn
Class B: "CS" SOG < 2kn
Class B: "CS" SOG
Class B: "SO" 0 kn
Class B: "SO" 2 kn
Class B: "SO" 14 kn
Class B: "SO" SOG > 23kn
Class A and Class B: no SOG available
AIS SAR aircraft
AIS aid to navigation
AIS base station
AIS search and rescue transponder
An AIS transponder "sees" all ships fitted with an AIS transponder belonging to either
a Class A or Class B AIS. Additionally, the AIS transponder receives messages from
ships and non-ships (AIS SAR aircraft, AIS aid to navigation, AIS base station, and
AIS search and rescue transmitter).
23kn
2kn
SOG < 2kn
SOG < 14kn
SOG 23kn
IMO nominal
reporting interval
3 min
3kn
10 s
10 s
6 s
2 s
3 min
30 s
3 min
30 s
15 s
5 s
N/A
10 s
3 min
10 s
N/A
Lost target
indication
(reporting
interval >)
10 min
50 s
50 s
30 s
10 s
10 min
150 s
10 min
150 s
75 s
25 s
10 min
50 s
10 min
50 s
10 min
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