Not the flight path per se, but altitude over 60,000 feet and/or speed over 1,000kts are limiting factors for GPS. [0] That said, there are certain GPS devices

Not the flight path per se, but altitude over 60,000 feet and/or speed over 1,000kts are limiting factors for GPS. [0] That said, there are certain GPS devices that can bypass the limits. [1] [0] http://en.wikipedia.org/wiki/CoCom http://en.wikipedia.org/wiki/CoCom [1] http://www.wired.com/wiredscience/2013/09/bypassin-us-gps-limits-for-active-guided-rockets/ http://www.wired.com/wiredscience/2013/09/bypassin-us-gps-li...