How do you use a wind vane?

Answer 1

It tells you the direction the wind is blowing. Very help for airplanes since they want to head into the wind for lift on takeoff and landings
It can be used to show the direction and speed of the wind by facing the way the wind is blowing.

Answer 2

A wind vane is a device that indicates the direction of the wind. To use it, you simply observe the direction that the vane is pointing in, which indicates the direction from which the wind is coming. This information can be helpful for activities like sailing, weather forecasting, or wind energy generation.