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    Re: Any happy/unhappy Astra IIIB owners here?
    From: Yves Arrouye
    Date: 2001 Apr 20, 7:41 PM

    > I own quite a few metal sextants, and my measurements
    > indicate that Tamaya
    > and Plath are more accurate than the Astra.  I have seen used
    > Tamaya Jupiter
    > sextants sell for about the same as an Astra IIIb and I think
    > I would prefer
    > a Jupiter over an Astra given the choice, but you will be
    > quite happy with a
    > new Astra as well.
    Celestaire's brochure gives 20" of accuracy for the Astra IIIB against 12"
    for the Jupiter. I wish the Astra IIIB had a bronze arc, if that's the
    secret in the reduction of precision.
    I've always wondered: how accurate is a good sextant user? I mean, is 20"
    going to be a limiting factor? That's an error of about 1/3 of a mile
    compared to 1/5 mile for the Tamaya Jupiter, right?
    P.S.: Dan, while reading your thread about your sextant accuracy at
    http://www.i-DEADLINK-com/lists/navigation/9903/0042.html you're mentionning Tom
    Metcalf's nav.c. Where can I find that and the relevant litterature? Do I
    need to get back issues of the journal of the institute for navigation?
    Another question related to what you wrote there: how's the Davis artificial
    horizon compared to the practice bubble horizon sold by Celestaire?

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