In rule 18, room is room for an inside boat to round or pass between an
outside boat and a mark or obstruction, including room to tack or gybe
when either is a normal part of the manoeuvre.
18.1 When This Rule Applies
Rule 18 applies when boats are about to round or pass a mark they are
required to leave on the same side, or an obstruction on the same side,
until they have passed it. However, it does not apply
(a) at a starting mark surrounded by navigable water or at its anchor
line from the time the boats are approaching them to start until
they have passed them, or
(b) while the boats are on opposite tacks, either on a beat to windward
or when the proper course for one of them, but not both, to
round or pass the mark or obstruction is to tack.
ISAF Rule 18
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