>can we know what range of altitude the plane is actually at? Near Norway right now, the pressure is 968 hPa. A pilot with an altimeter set to the standard 1013 hPa therefore has a pressure error of 45 hPa. There are about 10 m (30 ft) per 1 hPa. It will read '33 000 ft' when it is around 31 500 ft.
Over Portugal right now, the pressure 1033 hPa. A pilot with an altimeter set to the standard 1013 hPa therefore has a pressure error of 20 hPa. It will read '33 000 ft' when it is around 33 700 ft. >How did you come up with 33�000 ft = 26.2 kPa?� � http://mtp.jpl.nasa.gov/notes/altitude/altitude.html
