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With one satellite we can only know the distance a GPS device has from one satellite. Satellite will calculate the needed for a signal to go to the GPS device and back. This will form a with the edges on which the GPS device can be located.
With another satellite in place it will have two possible positions where the device is, we can imagine it as two points where two circles .
With a third satellite we will be able to find the exact location of the GPS device.
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