In: Gadget 科技玩意
3 Mar 2008Surprisingly, I still found a lot of my friends have no idea what is a GPS about.
From Wikipedia (ENG / 中),
The Global Positioning System (GPS) is the only fully functional Global Navigation Satellite System (GNSS). Utilizing a constellation of at least 24 Medium Earth Orbit satellites that transmit precise microwave signals, the system enables a [...]
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