GPS, which stands for Global Positioning System, is the only system today able to show , your exact position on the Earth at any given instant of time. The Global Positioning
System is a constellation of 24 satellites that orbit the earth twice a day, transmitting precise time and position (latitude, longitude and altitude) information.
Cavemen probably used stones and twigs to mark a trail when they set out hunting for food. The earliest mariners followed the coast closely to keep from getting lost. When navigators first sailed into the open ocean, they discovered they could chart their course by the stars. The next major developments in the quest for the perfect method of navigation were the magnetic compass and the sextant. The needle of a compass always points north, so it is always possible to know in what direction you are going. The sextant uses adjustable mirrors to measure the exact angle of the stars, moon, and sun above the horizon. GPS is one of the most fantastic utilities ever devised by man. GPS will figure in history alongside the development of the sea-going chronometer. This device enabled seafarers to plot their course to an accuracy that greatly encouraged maritime activity, and led to the migration explosion of the nineteenth century. GPS will affect mankind in the same way. There are myriad applications that will benefit us individually and collectively.
The technology evolved from, Mr. Marconi’s transmission of radio waves. This was applied for society during the 1920 's by the establishment of radio stations, for which you only needed a receiver. The same applies for GPS- you only need a rather special radio receiver. Significant advances in radio were
References: 1. http://en.wikipedia.org/wiki/Global_Positioning_System 2. http://www.gpsinformation.net 3. http://colorado.edu/geography/gcraft/notes/gps 4. http://www.thaitechnics.com/nav/gps.html 5. http://www.navipedia.net/index.php/GPS 6. http://www.kowoma.de/en/gps/history.html 7. http://support.radioshack.com 8. http://www.trimble.com/gps 9. http://www.howstuffworks.com/gps 10. http://www.gpsworld.com/