BOTH INTERNATIONAL & INLAND In illustration D023RR below which represents the arc of visibility of a red sidelight?

Correct Answer: Option A — A

Rule 21(b) defines the sidelights as showing an unbroken light over an arc of 112.5 degrees. The red sidelight is positioned on the port side. In standard nautical diagrams, the port side arc is represented by the sector covering 112.5 degrees from dead ahead to the port beam.