Two sailing vessels are approaching each other. Vessel A is on port tack, Vessel B is on starboard tack. Who gives way?
Short answer
Vessel A (port tack)
Under Rule 12, when two sailing vessels in sight of one another have wind on different sides and risk of collision exists, the port-tack vessel keeps out of the way. Vessel A should take early, substantial action and both vessels must continue monitoring the encounter.
Sources and scope
Reviewed by Richard Moore on . This answer is scoped to united kingdom and general recreational seamanship; check the current chart, publication, local rules and official operational guidance before acting afloat.
Quick check
Two sailing vessels are approaching each other. Vessel A is on port tack, Vessel B is on starboard tack. Who gives way?