[machrider]

Doesn't the military still rely heavily on GPS? I have a hard time believing they'd tolerate any kind of interference with such a crucial system.

[oigftrgtyh]

Yes - without it's operation many senior members of staff would be forced to learn map reading to find their way around Washington (or at least their drivers would)

[hcurtiss]

I believe M-code also operates on 1227.6 (L2). According to wikipedia, they do still use 1575.42 (L1).

http://en.wikipedia.org/wiki/GPS_signals#Frequencies_used_by...