KEN M. JOHNS / SCIENCE PHOTO LIBRARY KEN M. JOHNS / SCIENCE PHOTO LIBRARY
Global positioning system. Hand holding the receiver of a global positioning system (GPS) as it searches for a position. The system uses a network of GPS satellites, each of which sends out signals about its position and the time. This receiver is searching for these satellite signals. By using the signals, the receiver calculates and displays its latitude, longitude and altitude, as well as the local time. This is the Garmin 38 GPS.
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