The GPS (Global Positioning System) has been fully functional for nearly two decades. GPS consists of 27 satellites positioned in a medium earth orbit. A satellite is considered to be in medium earth orbit when it is 35,000 kilometers above the Earth’s surface, roughly 22,000 miles. The first experimental satellite was launched in 1972. It was not until 1995, 23 years after the launch of the first experimental satellite, that GPS bore fruit as a fully function satellite tracking system. Even then the system was restricted to military and airline industry use.
Once GPS was fully functional both the military and civilian implications were quickly recognized. In 1996, then President, Bill Clinton, opened the system to civilian uses as well as military uses. Due to limitations early civilian GPS was not very reliable and so its wide spread use had been severely limited. In 1998 and again in 2004 extra civilian signals were added to GPS. The net affect of the added civilian signals was that the quality and accuracy of the data were raised to a level that civilian GPS has now become a marketable product and service. Since 2004 GPS as a market technology has realized a...
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