What is GPS and how does it work?

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    Global positioning system.
    GPS is a network of satellites that can plot the position of a receiver on Earth by triangulation. Generally speaking it takes 4 satellites to position a receiver accurately (within 1 meter). The receiver receives the data from the 4 satellites and based on the direction the receiver is from each satellite it pinpoints it’s spot. Normally for triangulation there need only be 3 satellites but due to the distances involved there is also time deviation to measure.
    Since the GPS network currently (last I heard anyway) has 32 satellites it is very easy for any position on Earth to be in sight of 4 satellites at any given time.
    This animation demonstrates 24 satellites not 32 so there will usually be an extra satellite in view at all times.
    I can’t reference it without it putting the image in again. It is on wikipedia on the GPS page.

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