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    Re: A question for the geodisists
    From: Andrés Ruiz
    Date: 2013 Dec 21, 09:24 +0100
    Generally the causes of an effect are not unique.
    Paul clearly explains the problem from a purely geodetic point of view. To this may be joined measurement and data processing errors. Just as starting data not entirely accurate or not well known, (survey methods, terrestrial magnetic field varies over time, ...)

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