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    Re: iPhone as artificial horizon
    From: Bruce Hamilton
    Date: 2008 Sep 09, 19:13 -0700

    pls wrote:
    > It turns out that Apple's iPhone and iPod Touch make a nifty
    > artificial horizon.  Both devices have built-in angle/acceleration
    > sensors, so If one downloads Labyrinth Lite (currently the most
    > popular game download for the iPod), it has a set-up feature that
    > displays two right-angle leveling bubbles.  Use a couple of Post-its
    > to shim it into level and the screen makes a small but effective
    > sighting surface!  I haven't actually tried to measure the leveling
    > sensitivity, but my wild guess (based on how hard it isto chase the
    > bubble) it is something like a 10 - 30 min bubble equivalent.
    > -p
    > >
    If I duct tape an Iphone onto my sextant then write a program to do the
    calculations that has a built in star ID feature form the camera phone,
    I will have a great hi-tech sextant.  Why the heck would anyone even
    need a GPS feature!
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