Moderator note: Original thread is here: www.sciforums.com/threads/global-positioning-system.156976/ ----- This could be a great thread. So let's get to the main aspect. 1. What is the framework of GPS. The description of system and how to achieve. 2. Where SR comes into picture, what impact could it have and how it is taken care of. 3. Where GR comes into picture, what impact could it have and how it is taken care of. 4. Then finally, if we did not know about SR/GR, then could we have implemented GPS based on Newtonian etc.