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    Re: Hundreds of millions of GPS receivers
    From: Lu Abel
    Date: 2009 Dec 18, 22:40 -0800

    Well, the moon and stars are pretty reliable, but what about this thing
    called a Nautical Almanac that you need to know their GPs?   Or the HO
    249 tables.   All produced by the same technology that makes GPS
    receivers work, so if you feel uncertain about GPS you ought to feel
    uncertain about celestial.
    
    Kind of reminds me of a human factors study I read about years ago (wish
    I could recall it more clearly).   Anyway, some totally automated
    technology had been implemented and its human users wouldn't trust it.
    But when the implementors deliberately removed a quite simple step
    ("push here to start" or moving data from one program to another) and
    asked a the human operator to do it, suddenly the users confidence in
    the system skyrocketed because they suddenly felt "involved".
    
    Bruce Hamilton wrote:
    > 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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