Question 512 Rules of the Road

The correct answer is C) A vessel dredging. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, vessels engaged in dredging or underwater operations are not required to show anchor lights when at anchor at night. Instead, they must display the lights and shapes prescribed for a vessel restricted in her ability to maneuver. The other options are incorrect because power-driven vessels, vessels on pilotage duty, and vessels restricted in their ability to maneuver are all required to display anchor lights when at anchor at night, as per the COLREGS and Inland Navigation Rules.