INLAND ONLY You are overtaking another power-driven vessel in a narrow channel. The other vessel will have to move to allow you to pass. You wish to overtake the other vessel on her starboard side. What should be your first whistle signal?

Correct Answer: Option B — one short blast

33 CFR 83.34(c)(i) (Inland Rule 34) requires an overtaking vessel in a narrow channel to sound one short blast to indicate an intention to pass on the starboard side of the vessel being overtaken. This signal initiates the request for the other vessel to move and allow the passage.