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    Davis M3 -- (Davis M20) -- Astra IIIb
    From: Joe Shields
    Date: 2001 Apr 21, 15:04 EDT

    I learned Celestial with a Davis Mark 3.  On land using an artificial
    horizon or at the lake using a short-dip correction I'm consistently within
    +/- 1nm on Sun shots.  My question is... is there anything to be gained by
    moving up to one of the better Davis sextants (which financially I could do
    now... at least for a used one) or should I keep saving my money for an
    Astra IIIb?
    -- Joe (small lake sailor/ blue water sailor wannabe)
    > ----------
    > From:         Dan Hogan[SMTP:dhhogan{at}XXX.XXX]
    > Reply To:     dhhogan{at}XXX.XXX
    > Sent:         Saturday, April 21, 2001 12:58 PM
    > To:   NAVIGATION-L{at}XXX.XXX
    > Subject:      Re: Any happy/unhappy Astra IIIB owners here?
    >
    > I started out navigating with a Davis plastic sextant in 1963(?) or there
    > abouts. I used it on trips to/from Hawaii, Baja, and up/down the coast.
    > For a
    > small boat it kept an accuracy of 4 Nmi+/-. Used it up to 1984, when I
    > left
    > it laying on a plastic cushion on the way to Santa Catalina Island one
    > summer
    > day, it tried to turn into a ball. Then I bought a used Huson, I used it
    > until I got talked into exchanging it for a Freiberger.
    >
    > IMO a top of the line sextant is required only if you are going try
    > Lunars.
    > Otherwise, for *PRACTICAL* small boat navigation, most modern sextants
    > will
    > work admirably.
    >
    > Consider these errors:
    >         Your eyesight
    >         Boat motion
    >         Your plotting error
    >         Your method of sight reduction
    >         Any time error
    >         And, any errors in the charts
    >
    >
    >
    >
    > Dan Hogan WA6PBY
    > Catalina 27 "GACHA"
    > dhhogan{at}XXX.XXX
    > Navigation-L List Owner
    > http://www.wa6pby.com
    >
    

       
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