The RX 1 / RX 2 DSC start / Stop message is a completely normal message and is not an indication of a fault or problem.
Essentially, it’s just a text message indicating when one of the AIS receivers has started/stopped a DSC channel management listening period. Class B AIS transceivers are required to listen to channel 70 (the DSC channel) periodically at specific times defined in the standards, for DSC channel management commands.
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