Weather Vaning
Weather vaning is when a ship/boat/wings of a windmill/aircraft is allowed to spin in the direction of wind freely. Its basically allowed so that no damage/breakage to the equipement/machinery happens due to the force of the moving wind.
Under a heavy weather storm the drillship weathervanes. Weather Vaning
weather vane
To put your finger up your ass and pull it out to find the direction/ strength of the wind.
Let me just weather vane to see where the wind is coming from.