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    Re: On the integration of location and data
    From: Lu Abel
    Date: 2009 Nov 02, 21:28 -0800

    frankreed@HistoricalAtlas.com wrote:
    > And now we just need someone to write some applications that feature the 
    celestial navigation data prominently. This could inspire a really dramatic 
    increase in the number of people who are interested in celestial navigation.
    Ah, yes, I can see it now.  I point my iPhone at a celestial body.
    Between the built-in compass and the built-in GPS and the built in
    tilt-angle sensor, it figures out what body I'm pointing at and quickly
    uses the tilt angle (accurate to 0.1 minute, of course) to do a quick
    celestial reduction to generate a LOP.   Do it several times and there I
    have it, my position!
    Hey, all I need is a built-in gyro (maybe one of those laser ones) and
    I've also got a DR position!
    (Hmmm, wasn't all this part of a "sextant for the 21st century"
    discussion a while back? -- just point and shoot??   Then I wouldn't
    need to use a GPS will all that untrustworthy electronics :-) )
    While a "traditional" GPS doesn't necessarily have or need a built-in
    compass, if one thinks about it for a moment one realizes that
    automotive navigational systems DO need a built-in compass.   Else if
    you punch in an address while parked, how would they know whether or not
    to make the first instruction "make a U-turn?"
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