GPS?
GPS(Global Positioning System) was firstly invented for the use of US military. One day a plane was flying above restricted area, US army targeted it using missile as enemy, this was the heartbroken incident after this accident GPS was globally or you can say that it was publicly provided.
How GPS works???
US launched 72 satellites in orbit but out of 72, 2 satellites were destroyed. Now 30 satellites are orbiting earth orbit at height of 20000 km remaining are above these 30 satellites which covers blank spaces.
For determining current location of a device 4 satellites are needed to recognize it's current location. When at least three of four satellite recognize device then they transmit data to receiver which shows location of a device.
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