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Gadgets and Gizmos (India) - - KNOW TECH -

GPS re­ceivers on the ground can pick up the

sig­nals from at least three satel­lites and

cal­cu­late its own po­si­tion by de­ter­min­ing the

time it takes for the sig­nal to ar­rive from each

satel­lite’s known po­si­tion in space.

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