Question 1
X and A are approaching a mark to be left as indicated by the arrows.
Rule 17 does not apply to X. What is the latest time X may luff?
Answer 1
Rule 18 begins to apply when any part of the hull of either boat is in
the zone.
From this moment, if X luffs and thereafter has to bear away in order
to give A mark-room, then X breaks rule 18.2. X does not break rule 18.2
if she is able to luff while giving mark-room. A is required to keep clear
under rule 11. However, she will be exonerated under rule 18.5(a) if she
breaks rule 11 because X fails to give her mark-room.
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