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Internation Regulations for the Prevention of Collisions at Sea
Rule 12 - sailing Vessels
When two sailing vessels approach so as to risk collision one
shall give way as follows:
– with each having wind on opposite sides, boat with wind on port side
keeps clear.
– with wind on same side, boat to windward keeps clear.
– with wind on port side and unable to determine if a vessel to windward
has wind on port or starboard side then shall keep clear.
Windward side deemed to be the opposite side from which the
mainsail is carried or in a square rigger the opposite side from
which the largest fore & aft sail is carried.
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