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    Re: GPS shortcomings.
    From: Dan Allen
    Date: 2005 Jun 9, 09:01 -0600

    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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