[nobodyknowin]

Not GP but modern GPS / GNSS manufacturers intentionally do not allow their devices to function over some speed (1000 mph or something like that).

So they won't work on warheads as part of a guidance system.

[AlexanderTheGr8]

I never really thought of that. That's a pretty interesting restriction. Although any party with access to warheads that can fly 1000+ mph probably can bypass the GPS restriction, no?

[askvictor]

There was a guy in NZ (Bruce Simpson) who detailed on his blog how to make a DIY cruise missile. I think he got politely asked to stop doing so at some point.

[m463]

Just don't let some future party use your code to do it.

[nobodyknowin]

Not if they buy an off-the-shelf solution.