INLAND ONLY What whistle signal would a power-driven vessel overtaking another in a narrow channel, and wishing to pass on the other vessel's port side sound?

Correct Answer: Option D — two short blasts

Inland Rule 34(a)(i) requires that when power-driven vessels are in sight of one another and meeting or crossing at a distance within half a mile, the vessel intending to pass on the other's port side shall sound two short blasts. This signals the intent to pass port-to-port.