It says here[1] "All GPS receivers capable of functioning above 18 kilometres (11 mi) altitude and 515 metres per second (1,001 kn)[56] are classified as muniti

It says here[1] "All GPS receivers capable of functioning above 18 kilometres (11 mi) altitude and 515 metres per second (1,001 kn)[56] are classified as munitions (weapons) for which U.S. State Department export licenses are required. These limits attempt to prevent use of a receiver in a ballistic missile." News to me! http://en.wikipedia.org/wiki/Global_Positioning_System#Restrictions_on_civilian_use http://en.wikipedia.org/wiki/Global_Positioning_System#Restr...