Question 510 Rules of the Road

The correct answer is B) stern light. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a 20-meter sailing vessel underway is required to exhibit a stern light. The stern light is a white light placed as nearly as practicable at the stern and showing an unbroken light over an arc of the horizon of 135 degrees, and so fixed as to show the light 67.5 degrees from right aft on each side of the vessel. The other options are incorrect because: A) a combined lantern is only required for vessels less than 20 meters in length, C) the masthead lights are for power-driven vessels, not sailing vessels.