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About your AIS class B transponder | V3100 User Manual
Class A vs. SOTDMA Class B vs. CSTDMA Class B
A brief comparison between class A and class B AIS is illustrated in
the following table. V3100 is a SOTDMA class B AIS transponder.
Type of AIS Class A AIS Class B
SOTDMA
Class B
CSTDMA
Primary access
scheme
SOTDMA (Selforganizing)
SOTDMA (Selforganizing)
CSTDMA
(Carrier-sense)
Standard IEC 61993-2 IEC 62287-2 IEC 62287-1
Transmit power
and range
12.5 W 5 W 2 W
IMO mandate Mandatory
for all SOLAS
vessels
No mandate No mandate
Reporting rate
dynamic data
Highest
(transmission up
to every 2 sec)
Higher
(transmission up
to every 5 sec)
Low
(transmission up
to every 30 sec)
AIS data
presented
Static, dynamic,
voyage
Static and
dynamic data
Static and
dynamic data
Applications Commercial
vessels,
fishing boats,
working boats,
passenger boats
with more than
12 passengers
Smaller commercial, fishing
and work boats,
recreational
vessels
Recreational
vessels and
small fishing
boats
Static and dynamic vessel data
V3100 exchanges the following navigational data with other AIS
equipped vessels within VHF range to increase the safety of your
journey at sea.
There are two categories of information transmitted by an AIS transponder: static and dynamic data.
The vessel’s dynamic data is calculated automatically using the
installed GPS antenna.
This includes:
• Position of the vessel
• Speed over ground (SOG)
• Course over ground (COG)
• True heading