= Relative Velocity by NASA Glenn Research Center
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{tag=Work by NASA Glenn Research Center}
https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/relative-velocity/
Institutional primary explanation. Ground Reference, Wind Speed, Ground Speed and Airspeed distinguish the aircraft/air/ground reference frames and the relative-velocity subtraction. The examples restrict the wind to the flight direction; the vector crosswind calculation in Groundspeed is an original extension.
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