In addition, it includes 2 reserve satellites.
Yet, this fact brings on the plate interesting information – Each GPS satellite orbits the Earth at least once in every 12 hours.
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5. LORAN and Decca Navigation System
LORAN and Decca Navigation System were used during World War II.
The prime purpose of the GPS was to help in the navigation of planes and ships in a long range.
6. Identification of The Satellite in Its Orbit
The very first time when the identification of the Satellite in its orbit was determined by two American physicists was when the Soviet Union launched Sputnik in 1957.
7. Doppler Effect
The Doppler Effect has soon become the key point in using GPS tracking devices.
For many years the Doppler Effect has been overlooked due to the fact that it is providing worse accuracy than the standard method of GPS positioning is providing.
Moreover, the Doppler Effects might not be the most accurate ones but can be obtained even in really bad weather conditions.
8. GPS was first used by the US for military purposes
During the period of the cold war, there was a high need for a global navigation system. So, it can be considered as a trigger to the introduction of the actual GPS tracking device that we are using nowadays.
