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

Correct Answer: Option B — the give-way vessel

Rule 15 requires the vessel that has the other on her starboard side to keep out of the way. By sounding one short blast, the vessel is signaling her intent to alter course to starboard to pass astern, confirming her status as the give-way vessel under the crossing rules.