BOTH INTERNATIONAL & INLAND Which signal shall a vessel underway and making way in fog shall sound every two minutes?
Official USCG Answer & Rule Citation
Correct Answer: Option B — One prolonged blast
Rule 35(a) requires a power-driven vessel making way through the water to sound one prolonged blast at intervals of not more than two minutes. This signal is the standard audible warning for a vessel under power that is currently moving through the water in restricted visibility conditions.
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