Question 467 Rules of the Road

The correct answer is C) It must be an all-round white light. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a light used to indicate passing intentions must be an all-round white light. This is specified in Rule 34(c) of the COLREGS, which states that "when a vessel intends to overtake another vessel from astern, the vessel about to be overtaken shall exhibit a stern light or a stop light." The other options are incorrect because an all-round red light (A) is not the correct color for indicating passing intentions, and an all-round yellow light (D) is also not the correct color specified in the regulations. Option B, allowing either a white or yellow light, is incorrect as the COLREGS clearly state that the light must be white.