GPS Explained

You don't have to be a rocket scientist to understand it, but it sure helps. For the rest of us, here's a step-by-step explanation of how all this new-fangled sat-nav stuff works from the editor of IFR Magazine. Read this and you'll be able to toss around terms like "ephemeris" and "clock bias" and "orbital perturbations" with the best of 'em!

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