Two boats approach the pin end of a downwind finish line on opposite tacks. The Red boat (R) is on port tack while the Green boat (G) is on starboard tack. R hails for mark-room at the buoy, but G yells 'Starboard' and asserts her right of way without providing room. R has to sail on the wrong side of the mark, jibe and then tack to cross the finish line? What do the rules say about this situation?
Correct Answer: G broke a rule
Explanation : The Green boat (G) broke rule 18 because she did not give mark-room to Boat R. The pin end of the finish line is a mark that both boats are required to leave on the same side. And when the boats entered the zone around that mark they were overlapped. Therefore, according to rule 18.2b, the outside boat (G) is required to give mark-room to the inside boat(R). This situation is almost exactly the same as when two boats are approaching a leeward mark (e.g. the right-hand gate mark) that they will leave to starboard.