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Summary: to a more accurate set of codes within the GPS system called the P-code. It's ten times the frequency of the code used by the average citizens GPS receiver, more accurate, and harder to jam. The aviations industry, looking to use GPS for instrument landings, is developing a new type of GPS called Augmented GPS. It requires a geostationary satellite to make differential
Image Dimensions: 115 x 76
Image originally found here.