Diff. between ais class a & ais class b.

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class A aplies to all power driven vessel more than 300GT
and class B applies to small vessels like fisshing vsls. it can not transmit safety related messages, it can only rcv...it does not transmit ships name, destinaltion, eta, ROT, type of cargo etc.  

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• Diff. between ais class a & ais class b.