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    Re: Hundreds of millions of GPS receivers
    From: Bruce Hamilton
    Date: 2009 Dec 17, 22:25 -0800
    I even think that a GPS has become an important part of celestial navigation. I call it my AP indicator. :-)

     Since GPS is a single source, I don't take it's data as true until I confirm it through something trustworthy like a celestial shot.  I'm not sure if this GPS technology is always working, but the moon and stars are pretty reliable.

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