GPS is a Global Positioning System invented by the U.S(United States). It is a satelite based on navigation system made up of a network. The U.S placed 24 of those satelites into the orbit. The first one was sent to outerspace in 1978. It works 24 hours a day and it works in any weather conditions. GPS can calculate speed, track, trip distance, distance to destination, sunrise, sunset time and more. GPS is extremely accurate. It sends signal information to earth. GPS receiver uses this information to locate GPS users(their exact location). These satelites are traveling at 7000 miles per hour around earth.
Navigation receivers were made for aircraft, ships, vehicles, and for hand carrying. Now handphones and many other devices can have a GPS in it. It is a very important thing that we should have if we are traveling. Now you can get them for between $100-$1000.
I think in 10 years this technology will still be use, but maybe the U.S will improve the materials of the satelite to make it better and more accurate.
