Please note that nobody has successfully disputed relativity even though it is a huge issue in unifying our two models of physics today. GPS algorithms do have to take into account the speed of the satellite as well as its distance from Earth, which varies due to orbits used. GPS depends on time, and time passes at rates that are affected by mass and speed. GPS satellites travel at close to 9,000 mph. Their time runs about 7,000 nanoseconds per day slower than on Earth's surface. That's enough to throw off GPS positioning noticably. We dont notice it on Earth so much as that, because we're all about the same distance from Earth's center and traveling at about the same speed. Comparing time passage in Denver to that of our coasts would be difficult, I suspect. GPS satellites are about 12,000 miles up - not 1 mile up.