INTERNATIONAL ONLY A signal of intent must be sounded in international waters during which of the following situations?

Correct Answer: Option D — A vessel overtaking another in a narrow channel

Rule 34(c) specifically mandates that when vessels are in sight of one another in a narrow channel or fairway, an overtaking vessel intending to overtake must indicate her intention by the prescribed whistle signals. This is the only scenario listed requiring a signal of intent under International Rules.