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    Re: Ellipse of Confidence in position finding
    From: Andrés Ruiz
    Date: 2019 Mar 21, 09:44 +0100
    David,

    for example in:
    Navigation and Piloting. Dutton. 14th ed. ISBN: 0-87021-157-9
    Manual de Navegación. Martínez Jiménez, Enrique, 1978. ISBN: 84-400-5327-4
    ...

    The high_altitudes.obs file is an example that comes with my Navigation software. See high_altitudes.png


    El lun., 18 mar. 2019 a las 23:02, David Pike (<NoReply_DavidPike@fer3.com>) escribió:

    Obviously if you are close enough for the GP to be on your plotting sheet you can draw a circle of position.

    I’m sure that many years ago I saw an example of this in a book.  It was a fix from just one body, the Sun, passing close overhead, and it was called a ‘zenith fix’.  However, today I can find no mention of it either on-line or in any of my books including Lecky, where I was sure I must have seen it.  Am I dreaming again?  DaveP 

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    --
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/

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