Question 490 Rules of the Road

The correct answer is D) This condition is indicated by a conical shape, apex downwards. When a sailing vessel is under power with its auxiliary engine running and the propeller engaged, it is considered a power-driven vessel under the International Regulations for Preventing Collisions at Sea (COLREGS). In this case, the vessel must display the navigation lights of a power-driven vessel, which includes a conical shape with the apex pointing downwards. The other options are incorrect: A) is for a sailing vessel without auxiliary power, B) applies to a sailing vessel without power, and C) is not correct as the vessel is considered a power-driven vessel in this scenario.