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    Re: "100 Problems in Celestial Navigation"
    From: Dave Weilacher
    Date: 2004 Apr 1, 14:21 -0800

    I bought this book years back and gave up on it because it lacks proofs for 
    the answers given.  I had considered using this forum to help but couldn't 
    figure out how to do that without infringing on the author's well deserved 
    OTOH, answers 5-10nm different than his, aren't particularly unreasonable.  
    HO229, HO249, and various plotting programs, etc, can have that kind of 
    variation between them.  Even using the same tables, a sight reduction form 
    can introduce differences.
    If I recall his intro, he states that these are real life problems, and prone 
    to having blunders and errors in them/
    -----Original Message-----
    From: Renee Mattie 
    Sent: Apr 1, 2004 2:03 PM
    Subject: "100 Problems in Celestial Navigation"
    I'm having problems with "100 Problems"
    At Christmas, I received a copy of
    "100 Problems in Celestial Navitation
    Self-Contained -- with Answers" by Leonard Gray.
    I am having real problems working these problems.  I can't make get the
    "right answer". I don't know why.  I am not having trouble working
    Silcon Seas problems.
    The problems in 100 problems all seem extremely straightforward.
    You are given a most recent fix, a course, and a speed, and a new
    round of sights.  You must figure your DR location at the time
    of the sights and plot your position.  Straightforward.  I figure
    I ought to come within 1-2 nmi of the author.  But, after working
    the first 6 problems, I am finding myself 5-10 miles away from the
    author most of the time.
    Has anyone tried these problems?  Any comments?
    Dave Weilacher
    .US Coast Guard licensed captain
    .    #889968
    .ASA instructor evaluator and celestial
    .    navigation instructor #990800
    .IBM AS400 RPG contract programmer

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