BOTH INTERNATIONAL & INLAND You are in charge of a power-driven vessel navigating at night. You sight the red sidelight of another vessel on your port bow. The other vessel's after masthead light is to the right of her forward masthead light. You should __________.

Correct Answer: Option B — hold course and speed

Rule 15 designates a crossing situation where the vessel with the other on its starboard side is the give-way vessel. Because the after masthead light is to the right of the forward one, the vessel is heading towards you, establishing a crossing/head-on hybrid handled by maintaining course as the stand-on vessel if applicable, or holding course and speed.