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    Re: Navigator's Newsletter, and other forums.
    From: Paul Hirose
    Date: 2006 Oct 18, 12:18 -0700

    James R. Van Zandt wrote:
    >
    > The sight reduction methods I have seen require an estimated position [1],
    > or give no error estimate [2], or both [3].
    
    Have you read Kaplan's "navigation solution" paper at the USNO site?
    http://aa.usno.navy.mil/research/celnav.html
    
    His algorithm may give an error estimate. I can't remember. It's used in
    the Navy's STELLA software, which unfortunately is not available to
    civilians. If you could create an open-source implementation of Kaplan's
    algorithm, that would be some accomplishment. If nobody else steps up, I
    may attempt that someday. I have experience in the related area of
    orbital element least-squares adjustment. All my old source code is on
    5.25 inch floppies, that's how long ago it was.
    
    I don't believe that requiring an assumed position for a sight reduction
    is a significant problem in practice. And I suspect proficient
    navigators will pay little attention to a computer's error estimate.
    They will rely on their experience and intuition, based on the observing
    conditions and the way the LOPs look on the chart.
    
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