Gmdss : Element 7 - 300/600
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| The USA-INT control on VHF units: |
| A) Selects duplex operations for U.S. coastal waters and simplex operations in non-U.S. waters, on the "alpha" channels. |
| B) Changes selected international duplex channels to simplex channels for use in U.S. waters. |
| C) Both of the scenarios above may be set up and selected by the operator. |
| D) None of the above |
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