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The GPS satellites carry very stable [[atomic clocks]] that are synchronized with one another and with the reference atomic clocks at the ground control stations; any drift of the clocks aboard the satellites
Each GPS satellite carries an accurate record of its own position and time, and broadcasts that data continuously. Based on data received from multiple GPS [[satellite]]s, an end user's GPS receiver can calculate its own [[Four-dimensional space|four-dimensional position]] in [[spacetime]]; However, at a minimum, four satellites must be in view of the receiver for it to compute four unknown quantities (three position coordinates and the deviation of its own clock from satellite time).
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