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    Re: from a watcher
    From: Mike Burkes
    Date: 2002 Oct 17, 22:01 -0700
    From Mike,PS: The good old sin-cos of Hc is pretty hard to beat as you are well aware!
     
    ----- Original Message -----
    From: Robert Eno
    Sent: Thursday, October 17, 2002 8:42 PM
    To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    Subject: Re: from a watcher
     
    I feel compelled to comment on the following (clipped)


    ----- Original Message -----
    From: Dan Allen <danallen46{at}ATTBI.COM>
    To: <NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM>
    Sent: Thursday, October 17, 2002 9:52 PM
    Subject: Re: from a watcher



    > Note that the US nautical almanacs have a set of sight reduction tables
    > in them already so you actually only need one the volume if you do not
    > have a strong preference for a different set of tables.  Here again the
    > whole point of sight reduction is solving one formula:
    >
    -------------

    I do not recommend relying on the sight reduction tables in the Nautical
    Almanac. They are, in a word, difficult. I know because I tried and every
    time I thought that I had it aced, I'd end up making some really silly
    mistake. The tables are just too complex and require too many steps which
    opens one up to all kinds of errors.

    Better to stick with something simple and easy: HO 249 or even HO
    211(Ageton) although you do need a form for the latter tables. In the end,
    I'd go with a good $25 solar-powered calculator. They are very easy to keep
    clean and waterproof (a zip lock bag) and it is much easier to manipulate
    the spherical trig functions than fumble with complex tables.

    Please note that I am not denigrating these tables. I believe that they were
    designed by Admiral Davies, USN, who was not only a great navigator but a
    brilliant mathematician.  Unfortunately, most of us are not so well endowed
    in the cerebral department.

    Keep it simple I say.

    Robert
       
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