RULE 18
Mark-Room at a Windward Mark
Overlapped boats rounding a windward mark: the inside boat is entitled to room to round.
Approaching the windward mark on the same tack and overlapped at the zone, the inside boat is entitled to mark-room. The outside boat keeps clear and rounds wide. Note the laylines: the dashed lines are the close-hauled tracks that just fetch the mark.
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How it interacts with other rules
- Rule 18 — Mark-Room · see also
The same mark-room principle applies at leeward marks and gates.
- Rule 10 — On Opposite Tacks · see also
Rule 18 does not apply between boats on opposite tacks on a beat — port/starboard governs instead.