Field biologist using a global positioning system

Field biologist using a global positioning system

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Credit: PASCAL GOETGHELUCK/SCIENCE PHOTO LIBRARY

Caption: Location by satellite. Male field biologist finding his location using the hand-held receiver of a global positioning system (GPS). The system has a network of 24 GPS satellites, each of which sends out signals about its position and the time. By using the signals from four satellites, the biologist's latitude, longitude, altitude and local time are displayed. Photographed in Guyana.

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Keywords: biologist, electronic, electronics, global positioning, global positioning system, gps, gps receiver, guyana, hand-held, hand-held system, navigation satellite, receiver, satellite navigate, satellite navigation, technology, use

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