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Summary: to use GPS for instrument landings, is developing a new type of GPS called Augmented GPS. It requires a geostationary satellite to make differential corrections for the whole continent. Each of the 24 GPS satellites has it's own Pseudo Random Code (PRC). Kind of like it's own language . . . a very complicated digital language. This PRC is used to determine how far a GPS
Image Dimensions: 115 x 86
Image originally found here.