Question 527 Rules of the Road

The correct answer is A. The arc of visibility of a red sidelight, both for International and Inland Navigation Rules, is represented by section A in the illustration D023RR. The red sidelight must be visible from right ahead to 22.5 degrees abaft the beam on its respective side of the vessel, which corresponds to section A in the diagram. The other options are incorrect because they do not accurately depict the arc of visibility for a red sidelight. Options B, C, and D represent different sections of the overall navigation light configuration, but not specifically the red sidelight.