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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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