If boats are overlapped when the first of them reaches the zone, the outside boat at that moment shall thereafter give the inside boat mark-room. Rule 18.2(b,c)]." When a boat is required to give mark-room by rule 18.2(b), (1) she shall continue to do so even if later an overlap is broken or a new overlap begins.(2) if she becomes overlapped inside the boat entitled to mark-room, she shall also give that boat room to sail her proper course while they remain overlapped. However, if the boat entitled to mark-room passes head to wind or leaves the zone, rule 18.2(b) ceases to apply.[Rule 18.2(c)]. A Game for PC&Mac on TacticalSailing.com. Tips for iPad, iPhone on iTunes Tips for Tablet-PC, Smart Phone on Google Play.