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PostSubject: NAVIGATION SYSTEMS Systems.   Sun Oct 16, 2011 3:48 pm

Some GPS or Global Positioning System is an amount of two dozen satellites, which revolve for the earth. It is used to look for the location of a reciever across the world. This is done simply by sending radio signals for the electronic GPS recievers on the satellites. Every satellite is known for a reciever on earth. These signals contain data in the location of the satellites as well as the time taken for indicator transmission. The satellites are put twelve thousand miles above light of earth and complete 2 orbits each day. The functions of the satellites are periodically checked on and new ones are pumped to replace the old kinds.
With the improvement through technology, accuracy has improved. GPS systems have become more affordable along with earlier times. Accuracy differs contingent on various factors. Sometimes it can be as good as a couple meters. The GPS systems are available in plenty of areas. Further, decreases in costs have increased may be users. Fishermen and hikers implement portable GPS to navigate in your wild. Cars are being backed up with GPS systems, which make drivers better navigation abilities and better protection next to theft. It is employed by the military to guideline cruise missiles to pre-specified locates. Personal hand held devices like wrist watches have GPS to help with tracking people out and also getting their exact setting.
The system was produced by the Department of Defense on the US. It was at the beginning named NAVSTAR GPS. Belonging to the twenty-four satellites, the first one premiered in 1974 and one more in 1994. The Department of Defense powered down selective availability (SA) about 2 May 2000. The selective availability has been a cause for less accurate readings. The department reserves an appropriate to turn it rear on when they see the call to do so. The GPS systems turn out to be about 10 times more accurate than these people were when selective availability was active.
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