C2.9

Rule 18 is changed to:

18 MARK-ROOM
18.1 When Rule 18 Applies
Rule 18 applies between boats when they are required to leave a mark on the same side and at least one of them is in the zone .
However, it does not apply between a boat approaching a mark and one leaving it. Rule 18 no longer applies between boats when the boat entitled to mark-room is on the next leg and the mark is astern of her.
18.2 Giving Mark-Room
  1. When the first boat reaches the zone ,
    1. if boats are overlapped , the outside boat at that moment shall thereafter give the inside boat mark-room .
    2. if boats are not overlapped , the boat that has not reached the zone shall thereafter give mark-room .
  2. If the boat entitled to mark-room leaves the zone , the entitlement to mark-room ceases and rule 18.2(a) is applied again if required based on the relationship of the boats at the time rule 18.2(a) is re-applied.
  3. If a boat obtained an inside overlap and, from the time the overlap began, the outside boat is unable to give mark-room , rule 18.2(c) does not apply between them.
18.3 Tacking or Gybing
  1. If mark-room for a boat includes a change of tack , such tack or gybe shall be done no faster than a tack or gybe to sail her proper course .
  2. When an inside overlapped right-of-way boat must change tack at a mark to sail her proper course , until she changes tack she shall sail no farther from the mark than needed to sail that course. Rule 18.3(b) does not apply at a gate mark or a finishing mark and a boat shall be exonerated for breaking this rule if the course of another boat was not affected before the boat changed tack .