If GPS was not corrected for Einstein's Relativity…
…it would be off by around 11 kilometers according to the expert below.
This and more cool examples of how GPS is affected and corrected with Einstein’s Relativity here http://youtu.be/5qlLW60wOjo?t=28m45s . The speaker is Christopher Hegarty, Director for Communications, Navigation and Surveillance Engineering & Spectrum at MITRE.
Also if you want to get crazy about precise measurement check out the part at here http://youtu.be/5qlLW60wOjo?t=24m45s . She is trying to measure a change in distance equal to a single part in 10,000 of the width of a proton ( a proton is around 10 to the negative 15th power of a meter).
Tom
Log in to reply.