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Summary: 12 hours, guarantees that every point on the planet earth will be covered by at least 4 satellites at all times. The first satellite was launched in 1978, and the 24th was launched in 1993. A GPS can locate a lost vessel at sea, keep track of trucking and transportation services, control movement of vessels at sea, aid in crop dusting, help take aerial photographs, hone flight
Image Dimensions: 115 x 86
Image originally found here.