In article ,
Larry wrote:

The only thing they share is they are on the same frequency band, but not
the same channels. DSC is on 70, AIS is on 86 and 87A.

Actually, AIS uses the Duplex Receive Frequencies from Vhf Marine
Channels 86 and 87, as Simplex Transmit and Receive Channels......

Bruce in alaska
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add a 2 before @