What is the purpose of the INT-USA control settings on a VHF?
To change all VTS frequencies to Duplex so all vessels can receive maneuvering orders.
To change all VHF channels from Duplex to Simplex while in U.S. waters.
To change certain International Duplex channel assignments to simplex in the U.S. for VTS and other purposes .
To change to NOAA weather channels and receive weather broadcasts while in the U.S.
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