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    Re: HO 249 v. HO 229 v. Celesticomp
    From: Peter Smith
    Date: 1998 Jun 16, 9:31 AM

    On Tue, 16 Jun 1998 02:15:46 GMT, Rick Emerson  said:
    > After plotting a round of sun sights with both a Celesticomp and HO
    > 249, I was less than thrilled with the increased error in the 249
    > results.  Or maybe the Celesticomp's errors fit my expected results
    > better...  Anyway, I want to take the step from 249 to 229 and I'm
    > looking for advice on worksheets, etc.
    For HO-229 forms, Davis makes nice ones that you can buy from Celestaire
    (see www.celestaire.com for their on-line catalog).
    I'm not sure you'll see a dramatic difference in accuracy between HO-249
    and HO-229. Moreover, both use assumed positions, while your Celesticomp
    works from your DR, which is always nice. Not to steer you away from 229,
    which is what I use afloat, but if you're going to use your calculator
    as your primary method and are looking for a backup, table-driven method,
    you might consider:
     -- A DR-based table -- a few more calculations, but more convenient fixes
     -- A slimmer table than 249 or 229 -- 208, 211, or their progeny, esp.
        the tables in the back of the Nautical Almanac.
    The ideal backup might be Volume II of Bowditch (1975 or 1984 editions),
    which includes a wealth of information including the Ageton (HO-211)
    tables. This plus an almanac will see you through anything.
    Peter Smith -- psmith@wellspring.us.dg.com
    Data General Corp., Westboro, Massachusetts  (for whom I do not speak)
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