When we are asked to name the basic necessities of life, our cliched answer is food, water, housing and similar things. In this Hi-tech world however, there are many other things that are equally commensurate. Like cellphone, television, car, etc. Ever wondered how they work? Apart from money, electricity and fuel, Global Positioning Systems GPS also helps them to run. GPS is a positioning tool which works from the backend. Now-a-days it is equally serves the scientific as well as commercial needs.

Developed in 1973 by the Defense Department of United States, Global Positioning System was previously used to determine the location of military vehicles worldwide. With the advancements and development in every field, GPS is now used in cars, boats, planes, construction equipments,  cellphones, and serves a boon in the scientific group. It is a device mainly used to know the user's exact position anywhere under the sun. The satellites are placed in the space with the help of vehicles like the Arianne Rocket or the Space Shuttle. With the help of Global Positioning System, each satellite is placed in the orbit at some predefined location (a set longitude, latitude and altitude of the point). GPS antennas are fixed in cars, television antennas, radio frequency modulation is defined by the satellites in the space.