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    Re: The Darn Old Cocked Hat vs CG?
    From: Andrés Ruiz
    Date: 2013 Mar 21, 11:55 +0100

    2013/3/20 Hanno Ix <hannoix---.net>

    I keep missing something here, Andres.
    I sense you are using indeed a Bayesian approach, no?

    Should it work can it be done with paper and pencil, tables and slide rulers, alone?
    Can it be done in a reasonable time, no electricity allowed?  I mean in a time that 
    is comparable to the one the classical method requires, maybe less than an hour?

    Finally: Aren't computers in CelNav a gross anachronism? There might be occasions
    when this combination is needed  - for me it is wimpy.

    the approach in my paper is based in the treatment of the error in the least squares method.

    I have a hand held computer, (a notebook with W7 and a tablet in android), in my sloop, and works fine for chart plotting and celnav. I do not have time to be the pilot and the navigator at the same time, but yes to use the sextant.

    If you plot the LoPs by hand,  then you can plot a CEP or a confidence ellipse based in your common sense and perception of the nearby of a danger.

    See the fix and the 95% ellipse based in 4 observations (red) and in 3 (blue), eliminating the Moon one. The distance between the two fixes is 0.70 nm.

    Andrés Ruiz
    Navigational Algorithms





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