Can you give some information about the Wind wane?

Question

Can you give some information about the Wind wane?

Answer 1

Do you mean wind vane?

It is a device that  tells you which direction the wind is blowing from.

Answer 2

Wind wane angle correction : The wind direction angle is measured relative to the geographical north. Therefore, while mounting the wind wane on the mast, its north and that of a magnetic compass fixed near the operator’s seat are matched with the geographical north. However, during field operation, the vehicle is likely to be parked in any direction. The compass indicates the angle by which the wind wane is off geographical north. An electronic device has been developed to make the angle correction by appropriately modifying the wind wane output