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Rules of the Road

Uncertain tack

Technical visualUncertain sailing-vessel tack
Uncertain sailing-vessel tackA sailing vessel with wind on its port side sees a vessel to windward but cannot determine the other vessel’s tack.PORT-SIDE WINDTACK UNKNOWN
Uncertain sailing-vessel tackA sailing vessel with wind on its port side sees a vessel to windward but cannot determine the other vessel’s tack.PORT-SIDE WINDTACK UNKNOWN
Rule 12 uncertainty encounter: the other vessel’s tack is intentionally unresolved.

A sailing vessel with the wind on its port side that sees another sailing vessel to windward and cannot determine with certainty whether the other vessel has the wind on its port or starboard side must keep out of the way.

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