BOTH INTERNATIONAL & INLAND Two power-driven vessels are crossing as shown in illustration D042RR below. Vessel "A" sounds one short blast on the whistle. Vessel "B" is which of the following in this scenario?

Correct Answer: Option C — stand-on 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. Therefore, the vessel on the right is the stand-on vessel, maintaining course and speed.