Question 760 Rules of the Road

The correct answer is A) vessel crossing from your port. The lights shown in illustration D059RR indicate that the vessel ahead is a power-driven vessel crossing from your port side. According to the International Regulations for Preventing Collisions at Sea (COLREGS), when two power-driven vessels are crossing, the vessel that has the other on its own port side shall keep out of the way and avoid crossing ahead of the other vessel. The other answer choices are incorrect because: B) a head-on situation would be indicated by two white masthead lights in a vertical line, C) a vessel crossing from your starboard side would have its green sidelight visible, and D) an overtaking situation would be indicated by the overtaken vessel's stern light.