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    Re: Practice Bubble vs. Professional Bubble
    From: Bill B
    Date: 2012 Aug 05, 18:30 -0400

    On 8/5/2012 6:17 PM, Alan S wrote:
    > I have tried the practice bubble horizon without successa, possibly my
    > fault, the thing seems "tricky" to use and I have yet to get an
    > understandable explaination of the bubble correction factor, as with how
    > to determine it, ....
    It is simply a matter of looking at the difference of Ho and Hc from a
    known position (plus/minus IE).
    Under the K.I.S.S. principle, I determine LAN for my location, and do
    several observations while the sun's elevation changes very little. I
    also preset for Hs.
    In an attempt to minimize centering the bubble errors while aligning the
    sun, I had tripod mounted my preset sextant with the bubble as close to
    centered as I could see it. Even then results were plus/minus 2', so
    accurately seeing bubble placement is a limiting factor.
    Bill B

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