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    Re: GPS shortcomings.
    From: Robert Eno
    Date: 2005 Jun 9, 08:00 -0400

    Metal vs. Plastic is addressed in Joel Jacob's book, "The Myths and The
    Truth about Selecting a Marine Sextant".  My copy is dated 1975, so perhaps
    a lot of advances have been made in the plastics industry since then.  As
    Mr. Jacobs is an active list member, perhaps he will wade into this
    discussion.
    
    Robert
    ----- Original Message -----
    From: "Peter Fogg" 
    To: 
    Sent: Thursday, June 09, 2005 3:00 AM
    Subject: Re: GPS shortcomings.
    
    
    >> >>On Behalf Of Lu Abel
    >>
    >> Do you speak from experience or just theory about "plastic?"
    >>
    > When I've had the chance to examine them I've found them disconcerting to
    > use - for example, the index error was different each time I checked on
    > one
    > instrument, before and after taking a sight. It didn't inspire confidance.
    > I
    > know and accept that they have been used to cross oceans with, and
    > possibly
    > they are ideal for the task of teaching students.
    
    
    

       
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