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Summary: , control movement of vessels at sea, aid in crop dusting, help take aerial photographs, hone flight plans, facilitate air-avoidance systems, track forest fires, and monitor earthquakes. The US military has exclusive access 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
Image Dimensions: 115 x 86
Image originally found here.