INLAND ONLY Whistle signals shall be exchanged by power driven vessels in sight of one another when __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — they are passing within half a mile of each other
Inland Rules specifically mandate that power-driven vessels in sight of one another and meeting within half a mile shall exchange mandatory maneuvering whistle signals to clarify their passing intentions and prevent misunderstandings.
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