Question 520 Rules of the Road

The correct answer is C) 225.0°. According to the U.S. Coast Guard Navigation Rules, a vessel that is towing another vessel must display masthead lights with a visibility arc of 225 degrees. This means the lights must be visible from straight ahead to 22.5 degrees abaft the beam on both sides of the vessel. The other answer choices are incorrect because 112.5 degrees is the visibility arc for side lights, 135 degrees is the visibility arc for sidelights and stern lights combined, and 360 degrees is the visibility arc for an all-around white light, which is not the requirement for a towing vessel's masthead lights.