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The Concept Map you are trying to access has information related to:
GPS Phone Concept Map, Trilateration method of computation Intersection of three spheres drawn around the satellites, Towers function Carries signal from cell to cell, GPS receivers communicate using Orbiting satellites, GPS receivers determine location by Trilateration, Cell phones computers can determine Signal strength, consist of component GPS receivers, consist of component Cell phones, Networks of cells comprised of Base stations, Trilateration needs in order to compute Location of 3 satellites above you, Cell phones computers can determine Angle of approach to towers