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    Re: Averaging
    From: Bill B
    Date: 2004 Oct 20, 18:09 -0500

    > As Herbert Prinz quite rightfully pointed out, there are exceptions
    > where one indeed could introduce systematic error in excess of the
    > random error that is removed, so one has to be cautious.
    As I continue to look at 4 minutes spreads and averages, I have shifted my
    focus to the Hc 10d-20d range.  Here, even with a 20d-30d difference between
    latitude and declination I am getting a big 4-minute spread, in the range of
    45'-55', indicating  approx. .6'-.7' averaging error.  Herbert was indeed
    kinder to me with his numbers than he could have been.
    I won't make a value judgment as to whether that is too much shift for a
    particular navigator and/or under what circumstances.
    My question, is there a rule of thumb that might indicate when averages are
    acceptable and when not.  For example, for error of .4' or less (due
    totally to systematic errors from averaging) difference between latitude and
    declination, plus altitude should exceed 60d (or any other number that the
    gurus decide is reasonable?
    Thank you

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