The FAQ causes some confusion.
"Q: The rulebook states that a ship cannot do tight turns while running. Is this checked for at the beginning of a ship’s movement (like sailing points) or is it checked more often?
A: While a ship's attitude towards the wind doesn't change how many sailing points it gets throughout a phase, wearing and tacking cannot be done while the ship is running. This means that if you are in the middle of spending sailing points and find yourself running, wearing and tacking are not options until you are no longer running."
But re rules say your attitude does not change during the sailing phase so so you should never be concerned about wind direction after you first determine the ships attitude.