Yeah, what phord said. The government stopped inducing errors in the system back in 2000 i think. It used to be that non-military systems were accurate to 100 feet. He's further right in saying that there is too much infrastructure to start charging for gps. I will say that gps is not essentially unfunded now that the satelites are in orbit; the cost of maintaining at launching new satelites is easilly in the billions of dollars per year, and when you think of all that is depending on this system, it is good that we are investing such an ammount to keep it running well. Oh yeah, one more thing, the gps guided bombs and such: the military implementation of gps is of a far greater quality than the civilian implementation. Just like civilian nightvision is 4 generations behind the military's 100 grand per special forces operator nightvision the gps is much better, with hardware to overcome gps jamming and greatly increase accuracy. Again, this is quite desirable, we really don't want 1 ton bombs falling from a guided signal that is jammed or inaccurate.