Case 11: In the photo below, W6 has just rounded the leeward mark and tacked to starboard. W1191 is about to round the leeward mark.
1. Does being subject to rule 18 give W1191 any protection from W6 here?
2. What limitations does rule 16 place on W6 here?

Answer:
1. No. Rule 18 only applies between boats that are "about to round or pass a mark ...", and here, only W1191 is about to round or pass, so rule 18 cannot apply, and the situation reverts to rule 10 (port/starboard).
2. W6 must not alter course in any way that will leave W1191 insufficient room to keep clear.

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