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    Re: GPS shortcomings.
    From: Carl Herzog
    Date: 2005 Jun 9, 11:16 -0400

    Dan Allen wrote:
    
    > 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.
    
    I've used and taught with them all underway. The Mk3 is pretty
    worthless, except as a demonstration of principles. The Mk15/25 is
    perfectly usable for sun sights, but its optics don't cut it for star
    work. If you buy one new, take care of it, adjust as necessary and check
    index error with every shot, it makes a fine backup tool and learning
    sextant.
    
    However, for durability, accuracy, and optics that allow a broader range
    of use, pick up an Astra IIIB. It's definitely worth it. Can't beat it.
    
    Carl Herzog
    
    
    

       
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