Question 1
A on starboard enters the zone of a windward mark clear ahead of X. X
tacks onto port and then tacks back onto starboard. She then establishes
an inside overlap with A from clear astern. Does A have to give X mark-room?
Answer 1
No. X is required to give A mark-room. At position 1, rule 18.2(b) applies
and X must give A mark-room. At position 2, the boats are on opposite
tacks on a beat to windward and rule 18 ceases to apply (rule 18.1(a)).
When X tacks back to starboard after position 2, the boats are on the
same tack and rule 18 begins to apply again. In particular, rule D1.1(b)
applies which changes rule 18.2(b). A becomes clear ahead when X passes
head to wind, so X must thereafter give A mark-room.
Question 2
Would the call be different if X’s tacks are in the zone?
Answer 2
No. Providing that at the moment X passes head to wind between positions
2 and 3, she is clear astern of A, she must give A mark-room.
See also Call E 10
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