1 Scope
This part of IEC 62287 specifies operational and performance requirements, methods of testing and required
test results for Class B “SO” shipborne AIS equipment using Self-organised TDMA (SOTDMA)
techniques as described in Recommendation ITU-R M.1371. This standard takes into account
other associated IEC International Standards and existing national standards, as applicable.
The main differences between Class B “CS” (IEC 62287‑1) and Class B “SO” units are that the Class B “SO”:
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• covers all 25 kHz channels listed in Recommendation ITU-R M.1084-5;
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• only uses the internal GNSS, no position sensor input is allowed;
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• requires use of VDL Message 17 for correction of the internal GNSS;
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• has a presentation interface;
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• has additional reporting intervals, down to 5 s;
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• has two power settings, with a high level of 5 W;
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• has the capability to transmit binary messages.
It is applicable for AIS equipment used on craft that are not covered by a mandatory
carriage requirement of AIS under SOLAS Chapter V.