• GPS stands for global positioning system, which is a network of at least 24 satellites. A GPS receiver (more commonly referred to simply as a GPS) is a device that receives microwave signals from GPS satellites to aid in navigation by providing exact location, speed and time.

• Fast Facts

  1. GPS stands for Global Positioning System
  2. Official name: NAVSTAR GPS
  3. NAVSTAR = NAVigation Satellite Timing And Ranging
  4. Developed by U.S. Dept. of Defense
  5. Uses a network of at least 27 satellitesHowStuffWorks: How GPS Receivers Work
  6. Cost about $750 million annually to maintain

• History

  The GPS was developed by the US Department of Defense and is officially named the NAVSTAR GPS. The name was given by John Walsh, a key person who helped make the budget for the GPS. The United States spends about 750 million dollars maintaining the GPS system.

• How It Works

  A GPS works by calculating its distance from four or more satellites. It takes a very large number of satellites since it needs a very accurate time in order to function like it is supposed to. The receiver receives the measurements and then calculates for each of the stated measurements and converts them into a latitude and longitude format using Geometry and Trigonometry, which then displays on the screen.

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