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The Concept Map you are trying to access has information related to:
GPS, figures both by radio signals, Global Positioning System it's job to locate 4 or more satellites, distance between you and each satellite GPS figures both, US military for a military navigation system, Global Positioning System must know location of at least 3 satellites, trilateration which basically looks for the intersection, figure out the distance to each and deduce its own location, Global Positioning System developed by US military, Global Positioning System developed by Camille Potvin, location of at least 3 satellites and distance between you and each satellite