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- Global Positioning System (28209 bytes)
7: ...epartment of Defense]] and can be used by anyone, free of charge.
12: A GPS receiver decodes time signal transmissions from multiple satellites and calculates its position...
23: ...nge]]). It then decodes the satellites' locations from their radio signals and an internal database.
24: ...vation information is already known, only signals from three satellites are needed (the point is then ...
30: ...d of radio waves based on their frequencies, dual frequency receivers can actually measure the effects...
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