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Thread: Use GPS on plane?
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Old Apr 10, 2009 | 6:17 am
  #21  
Yaatri
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Join Date: Jan 2002
Posts: 22,778
Originally Posted by SJUAMMF
The GPS receiver can calculate speed without being on the ground although it will take longer to get a fix while it is moving. Position of the receiver is calculated from position of the satellites and time. So it will work even at airplane altitudes.

http://tycho.usno.navy.mil/gpsinfo.html
http://www.trimble.com/gps/howgps.shtml
http://www8.garmin.com/aboutGPS/
You do know what ground speed is? Ground sped does not mean the object is on the ground.

Positioning data alone can only give you ground speed. Other data is needed to calculate air speed.
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