| The Global Positioning System, commonly
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| | conditions.
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| called GPS, is a navigational system
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| | The GPS system became fully functional in
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| that uses satellites and computers to
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| | 1985. Today it is used for navigating on
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| determine the latitude and longitude of a
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| | land, sea and air. It is also used for
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| receiver on Earth. This is done by
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| | mapmaking, land surveying and scientific
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| computing the time difference for signals
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| | research.
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| from different satellites to reach the
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| | Over the last fifteen years, the accuracy
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| receiver.
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| | of the GPS signal has improved steadily.
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| GPS is the only satellite navigation
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| | Today, a GPS system can accurately
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| system that is fully functional. It uses
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| | pinpoint the receiver on Earth to almost
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| a collection of more than twenty-four
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| | five meters of its exact location.
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| satellites to send radio signals to
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| | However, further improvements and
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| electronic GPS receivers. By doing so,
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| | developments may increase the accuracy to
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| the satellites are able to find the
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| | about 1 cm of the receiver. This can be
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| correct location of the receivers. They
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| | done using techniques such as
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| get the exact longitude, latitude and
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| | differential GPS. A GPS also gives an
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| altitude of the receiver. GPS systems
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| | extremely precise time reference which is
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| work around the clock under any weather
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| | useful in some scientific experiments.
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