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GPS is a simple matter of linking up 2 receivers using time as an indicator of how far 2 objects are apart thus giving you an indication of their positions relative to real time positions on earth and if those exchanges of information are blocked due to an obstruction then these times are different and the processors at the satellite will detect this and give an error in the form of a lost or inadequate signal.

http://www.nasm.si.edu/gps/work.html

[QUOTE="mackmobile43, post: 249554, member: 6232"] GPS is a simple matter of linking up 2 receivers using time as an indicator of how far 2 objects are apart thus giving you an indication of their positions relative to real time positions on earth and if those exchanges of information are blocked due to an obstruction then these times are different and the processors at the satellite will detect this and give an error in the form of a lost or inadequate signal. [URL="http://www.nasm.si.edu/gps/work.html"]http://www.nasm.si.edu/gps/work.html[/URL] [/QUOTE]

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