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    Re: GPS shortcomings.
    From: Lu Abel
    Date: 2005 Jun 9, 08:11 -0700

    Dan:
    
    The Davis Mk 3 was a toy.  I, too, once purchased one and found it
    completely useless.  (I notice that Davis no longer manufactures it)
    
    Please do not judge the Mk 15 or Mk 25 by the Mk 3; the Mk 15/20/25 are
    real micrometer drum sextants whose only "fault" is being made out of an
    engineered plastic.
    
    Lu Abel
    
    
    Dan Allen wrote:
    > On Jun 8, 2005, at 11:05 PM, Lu Abel wrote:
    >
    >>> Metal is more reliable. Won't warp and is less liable to temperature
    >>> effects. Nothing new or controversial here.
    >>
    >>
    >> Do you speak from experience or just theory about "plastic?"
    >
    >
    > I have not used a Davis Mk 15 or Mk 25, but I do own a Davis Mk 3,
    > the $34 Davis.
    > It is terrible: 20-50 mi accuracy.  Maybe it warped and is atypical,
    > but the whole experience of using it is so bad that I just ignore it
    > now.
    >
    > Buy a new Astra IIIb, or a used metal sextant if you have to.
    > It will improve your accuracy just from the pride of ownership!  ;-)
    >
    > Dan
    >
    >
    
    
    

       
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