down from where you want to be. That means your GPS has to be precise.
Really precise. It relies on atomic clocks on-board the satellites. These clocks are
precise to the nanosecond scale. Your phone accessing the GPS signal is the Earth based
observer. Do you expect the atomic clock to run slower or faster than the clock on your
phone? Is the time on the atomic clock the proper time or dilated time? Is the time on
your phone the proper time or dilated time?