The USA-INT control on VHF units:
Selects duplex operations for U.S. coastal waters and simplex operations in non-U.S. waters, on the "alpha" channels.
Ensures that the “alpha” channels are correctly set to duplex for use in U.S. waters & on VTS channels.
Changes selected international duplex channels to simplex channels for use in U.S. waters, on the "alpha" channels.
Changes selected international simplex channels to duplex channels for use in U.S. waters, on the "alpha" channels.
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