BOTH INTERNATIONAL & INLAND In illustration D023RR below "B" represents the arc of visibility of which of the following?

Correct Answer: Option C — green sidelight

Rule 21(b) mandates that sidelights show an unbroken light over an arc of 112.5 degrees. The green sidelight is located on the starboard side of the vessel. In standard navigation diagrams, the starboard sector covering 112.5 degrees from dead ahead to the starboard beam represents the green sidelight.