67.5 + 67.5 = 135 astern, question wrong Rule 21(c) clear as day
Deck
Rules of the Road: BOTH INTERNATIONAL & INLAND The stern light shall be positioned such that it wil...
Discussing this exam question.
You are correct, it shows through 135 degrees but the question is asking how many degrees the arc shows through from dead astern to it's furtherest most side of the vessel. Essentially it is asking your to answer what is 1/2 the arc of the light.