BOTH INTERNATIONAL & INLAND When two power-driven vessels are crossing, which vessel is the stand-on vessel?

Correct Answer: Option A — The vessel which is to starboard of the other vessel

Rule 15 dictates that when two power-driven vessels are crossing so as to involve risk of collision, the vessel which has the other on her own starboard side shall keep out of the way and avoid crossing ahead. Therefore, the vessel to starboard is the stand-on vessel.