The existing GPS (Global Position System) was invited in 70th XX century, in USA. Now it works thanks three of twenty-four orbit saletlits. GPS indicate our position using triangulation method between three satelits. Undeniably it is using in a lot of area of life. Main functions of satnav are indicate position of something, measure distance between two points on map and navigation in travel. It have application in monitoring vehicles and find stolen cars by spy their position, in army by helping in targeting rockets, in geological exploration by find minerals deposits deeply underground, in civil engineering by seeting out position and levels of new structures. It was primary developed for US Army, for the purposes of combat. Thanks to, they wanted to observe position of their and enemy army. I think enable people to using that great system revolutionized our present life.
bosmin