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Imagine you are on a baseball diamond. We have cloned Nolan Ryan, as part of our evolutionary experiment and have placed him on the pitcher's mound, first, second, third, shortstop and catcher. What's more, we tweaked his DNA so that he consistently pitches at 90MPH. We put you anywhere on the field with a stopwatch, and have all our Nolan Ryans throw you a 90MPH fastball. Based on how long it takes for each ball to reach you, we know how far away you are from any particular Ryan. Given a constant of time, all of those distances will intersect at one point and one point only.

-Proof, explaining GPS to a probable P.E. Major