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 Personal Mini GPS Tracker + SMS Alerts US $119.99 
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How gps technology works?
vehicle tracker/personal tracker
The system is called "triangulation" and is easily demonstrated.
You can demonstrate the method with a sheet of A4 paper, a pen and a ruler.
Draw a triangle and mark the corners A, B and C.
Draw a dot somewhere within the triangle and mark the dot, 0.
The points A, B and C are three satellites and the point 0 is your car.
Draw three lines to connect A, B and C to 0.
The computer in the GPS device knows where the satellites are and is able to use the angles of the three lines to calculate the position of your car. The computer knows the spot on the earth that is directly under each of the three satellites. This system is highly accurate and is used to navigate not only cars but ships and aircraft.
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