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why doesn't air-traffic control use GPS?

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  • why doesn't air-traffic control use GPS?

    http://www.cnn.com/2008/TECH/10/09/outd ... index.html


    <<....The $35 billion plan would replace the current radar system with the kind of GPS technology that has become commonplace in cars and cell phones. Supporters say it would triple air traffic capacity, reduce delays by at least half, improve safety and curb greenhouse gas emissions.

    An Associated Press analysis of federal and industry data found that if the new system were already in place, airlines could have saved more than $5 billion in fuel this year alone.....>>
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