Tuesday, June 10, 2008

"GPS"? How much do you know about it?

Global Positioning System (GPS) is actually a constellation of 27 Earth-orbiting satellites (24 in operation and three extras in case one fails). This advanced technology can accurately track where our position is. Do you know how does GPS work? How does GPS improve humans' lives? The following video will give us a clear illustration about how GPS work.

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