GPS reception requires an unobstructed line of sight to four or more GPS satellites, and is subject to poor satellite signal conditions. Though the GPS satellite data is free and works anywhere in the world, the GPS device and the associated software must be bought or rented.Ī satellite navigation device can retrieve (from one or more satellite systems) location and time information in all weather conditions, anywhere on or near the Earth. GPS was originally developed for use by the United States military, but in the 1980s, the United States government allowed the system to be used for civilian purposes. The Global Positioning System (GPS) is one of a handful of global navigation satellite systems (GNSS) made up of a network of a minimum of 24, but currently 30, satellites placed into orbit by the U.S. Using suitable software, the device may display the position on a map, and it may offer routing directions. A satellite navigation device, colloquially called a GPS receiver, or simply a GPS, is a device that is capable of receiving information from GNSS satellites and then calculate the device's geographical position.
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