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50.0 MB (2.6 MB compressed)
5125 x 3410 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
JOHN GREIM / SCIENCE PHOTO LIBRARY JOHN GREIM / SCIENCE PHOTO LIBRARY
GPS unit in the window of a car in traffic at night. Satellite navigation systems use signals from satellites orbiting the Earth to calculate the exact position of a vehicle. Such systems can be used for car, train and aircraft guidance, rescue services, and numerous other applications. This system uses the GPS (Global Positioning System) satellite network. It is instructing the driver to turn right onto Pennsylvania Route 132, at a junction in the town of Feasterville-Trevose, Pennsylvania, USA.
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