A US satellite system that lets those on the ground, on the water or in the air determine their position with extreme accuracy using GPS receivers.
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one of the leading digital cellular systems. GSM uses narrowband TDMA , which allows eight simultaneous calls on the same radio frequency.
- Browse Related Terms: analog, CDMA (Code-division multiple access access), cellular, GSM (Global system for mobile communication), TDMA (Time-division multiple access)