INTERNATIONAL ONLY A power-driven vessel leaving a quay or wharf must sound what signal?

Correct Answer: Option D — No signal is required.

Rule 34(a) applies only to vessels in sight of one another. Under International Rules, there is no requirement for a power-driven vessel to sound a whistle signal when leaving a quay or wharf. Such signals are specific to Inland Rules, which mandate a prolonged blast for vessels departing a dock.