"Newps" wrote in message
...


Suppose you are navigating solely by GPS. What are you going to do in
the event the military chooses to disable the GPS system while you're
airborne

Can't be done. There is no on/off switch.


While I am quite sure there is a a way they could turn it off if they
decided to they certainly could make it incorrect without the proper
decryption hard/software that the GPS in your plane will think it is flying
over JFK when you are in LAX.