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    Re: Bowditch tables 12 and 13
    From: Bill B
    Date: 2012 Aug 15, 22:38 -0400

    On 8/15/2012 9:07 AM, Jeremy C wrote:
    > I don't know where the .06 factor comes from as geometric horizon would
    > seem to me to be a straight line tangent to the curve of the earth.
    Thanks Jeremy, Greg and Lu.
    In the bigger picture I am trying to lay the foundation for devising a
    method of using the practice bubble, or a sextant like the Navy Mark V
    that can see the horizon, as crude dip meter (from a stable platform.)
    I see the first step as calibrating the bubble error from a natural
    horizon. More on that later under a separate subject heading.
    Bill B

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