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    Re: Self-Contained Celestial Navigation with H. O. 208
    From: George Huxtable
    Date: 2010 Feb 9, 12:46 -0000

    Andres pointed out-
    
    
    I have found this with google:
    Self-Contained Celestial Navigation with H. O. 208 by John S. Letcher, Jr.
    www.devill.net/Infos/Astro/Celestial-navigation-with-HO208.pdf
    
    I think is still under copyright!!!
    
    =============
    
    from George-
    
    Unfortunately, this is a copy only of certain selected chapters, not the
    complete work, and misses out the 90-page full copy of HO 208 (Dreisenstok),
    included within the printed edition.
    
    However, it's a useful selection, providing (for example) a pretty good
    explanation of taking lunar distances. Letcher also offers techniques which
    I have frequently criticised for their limited accuracy, such as
    longitude-around-noon, and lunars-from-altitudes. In these cases Letcher is
    commendably careful to emphasise the situations in which they can be
    usefully applied, and their limitations.
    
    It's a book which I heartily recommend, if you can lay your hands on a
    printed version. It shows its date (1977) somewhat, in that in refers to the
    early days of trig-capable calculators, but not programmable ones.
    
    Speaking of Letcher, he has written an excellend book on self-steering gear,
    if anyone goes in for that stuff nowadays. I think he has been a  regular
    contributor to a US sailing magazine (maybe still is).
    
    George.
    
    contact George Huxtable, at  george{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
    
    
    
    
    
    

       
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