How do the rules apply here? Luke had right of way under Rule 11, but he owed Stella mark-room under Rule 18.2(b)’s first sentence. As the definition Mark-Room states, Luke was required to give Stella room to leave G1 to starboard, which he did. And after she entered the zone, Stella’s proper course was to sail straight toward her next mark—Mark L, and, as the diagram shows, that course took her close to Mark G1. Luke, therefore, was also required to give Stella room to sail to G1, which he also did. It wasn’t necessary for Stella to round G1 to sail her course, so when Luke began to luff, just after Position 2, Luke had already given Stella all the room to which she was entitled under the definition Mark-Room. Thus, Stella’s entitlement to mark-room had ended and the only rules that applied between the boats were Rules 11, 16.1 and 14.