ICAO Annex 3
Chapter 4. Meteorological Observations and Reports
4.6 Observing and reporting meteorological elements
4.6.1 Surface Wind
4.6.1.1 The mean direction and the mean speed of the surface wind shall be measured, as well as significant variations of the wind direction and speed, and reported in degrees true and metres per second (or knots), respectively.
Note: The wind direction broadcasted by the ATIS and ATC is given in degrees magnetic.
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