Once upon a time, people had not any GPS system and they were dependent on looking at the stars in the sky. But now times have changed. We live in the midst of advanced technology. However, we currently do many important tasks including location determination through artificial satellites. It is also possible to determine the pin point location of through GPS.
Even if you are in the middle of vast desert, ocean or deep forest, it is possible to determine your pin point location with GPS. Everyone is curious about why we are getting this service for free and how this work is done. The GPS receiver that comes with your phone can pick up signals from satellites.
When you turn on location on the mobile it starts receiving the signal. Suppose you are currently in Dhaka and your mobile is receiving signal from an artificial satellite located in the sky of France. Now the distance between these two is determined and a circle is drawn.
You are located at either end of this circle. Simultaneously it receives signals from many more satellites and draws out your pin point location by drawing a circle.
The US Department of Defense controls these satellites. But the satellites do not know when and how and where all these services are being used. As a result, there is not much scope for strict surveillance. But we don’t get this service for free. The company sells the device to us. And they pay tax for this service.
