[colechristensen]

The FCC would have absolutely no problem at all throwing around at least 5-digit fines for doing these things.

Beyond that, though, GPS is still considered military technology. The state department could very well come after you for exporting military tech were you to even make a blog post about it while based-in or having any ties to the US. They really don't fuck around with this stuff.

I got to play with a real GPS simulator a few years back for a school project (visiting the local defense contractor to verify some equipment) the narrow part of which was testing an unlocked (height and velocity restrictions disabled) GPS receiver as it would work in LEO.