Global Positioning System
GPS, or Global Positioning System, is a satellite navigational system orbiting the earth and their receivers on earth. The GPS satellites transmit digital radio signals that contain data to the receivers on earth. Based on this information the receivers can pinpoint a location on the earth. By using three satellites, GPS can calculate the longitude and latitude, and by using four satellites, GPS can also determine altitude. Any prepared outdoorsman will include a GPS unit as part of his gear, especially in unfamiliar locations.
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