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CHAPTER 1 INTRODUCTION The Global Positioning System (GPS), comprised of three integral segments, is one of the newest and most efficient forms of locating a global position. It was developed by the United States of American department of Defense (DoD) for military purposes. Since its creation it has developed many different uses. The three distinct segments are the user, space, and control segments. This report will explain what each of these segments entail with an emphasis on how they work together to provide the user with a GPS position. The Global Positioning System is a large system of satellites that orbit the earth. These satellites transmit signals that are received by the user. The user to find a precise position on the earth then processes the signals. All sorts of people for all kinds of reasons use GPS. They could be military reasons, for example using GPS to aim a missile. GPS is used in vehicle navigation whether that be a plane, automobile, or boat. Land surveyors also use it since it can now produce sub-centimetre accuracy. The report will discuss the three segments of GPS, the user, space, and control segments. These three segments are all so intertwined that each would be useless on its own.