J.P.DANVOYE,PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY J.P.DANVOYE,PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
GPS receiver held in a hand. GPS (Global positioning system) uses a network of satellites to calculate the user's location on Earth. Each satellite sends a signal that is detected by the handset, and it calculates its position by triangulation. Photographed in Greenland.
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