Gmdss : Element 7 - 301/600
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| The USA-INT control on VHF units: |
| A) Was made necessary by a desire for more simplex channels in the U.S. |
| B) Correctly set, will result in duplex operations in U.S. Coastal waters on the "alpha" channels. |
| C) Correctly set, will result in simplex operations in U.S. Coastal waters on the "alpha" channels. |
| D) Both a) and c) are true |
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