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GPS satellites carry atomic clocks that provide extremely accurate time. The time information is placed in the codes broadcast by the satellite so that a receiver can continuously determine the time the signal was broadcast.
How does a Pulse Oximeter work? A Pulse Oximeter works by shooting light through the area of our body being used for the measurement (lets, assume from now onward that it is a finger) and detecting the amount of light that managed to to through that finger.