The GPS receiver calculates its position based on signals from at least four different satellites, by measuring the time it takes for a message to travel between the receiver and the satellite. Most GPS errors are the result of the receiver’s clock being “off” by as little as one microsecond."And we all carry these astonishingly precise scientific instruments around with us in our pockets and on our dashboards, never giving them a second (pun intended) thought.
Footnote: 1 microsecond = 0.000001 second
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