Question 735 Rules of the Road

The correct answer is A) One white light. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, a vessel underway at night and being overtaken from astern should display a single white stern light. This light helps indicate the vessel's presence and orientation to the overtaking vessel. The other options are incorrect because: B) Red and green sidelights are displayed on the sides of the vessel, not the stern; C) Two white lights would indicate a towing vessel, not a standard underway vessel; and D) One white light, without sidelights, is the correct configuration for an overtaken vessel at night.