Quick Instruction, Version 1.0
Page 9 of 43 pages
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1.2
What AIS classes do exist?
The scenario below shows a full AIS coverage area (including all applica-
tions and complete shore infrastructure).
There are two classes of AIS units fitted to vessels, Class A and Class B. In
addition AIS base stations may be employed by the Coastguard, port
authorities and other authorized bodies. AIS units acting as Aids to
Navigation (A to N) can also be fitted to fixed and floating navigation
markers such as channel markers and buoys.
1.2.1
Class A
Class A units are a mandatory fit under the safety of life at sea (SOLAS)
convention to vessels above 300 gross tons or which carry more than 11
passengers in International waters. Many other commercial vessels and
some leisure craft also may be fitted Class A units.
The
Class A
operation consists of three different types of messages:
