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    Sextant Accuracy
    From: Fred Hebard
    Date: 2003 Mar 16, 20:45 -0500

    The location of my house seems to be settling down to perhaps 0.3 to
    0.4 nautical miles north of its actual location.  All of this with an
    artificial horizon.  One new technique I tried was to preset the
    sextant to the future altitude of a body and then watch the body pass
    through that altitude while listening to the time being counted out.
    My general objective is to get these observations as accurate as
    possible, say to within 0.1 or 0.2 miles.  I'm not sure why I have this
    objective, but it persists.
    Bill Murdoch mentioned he had never bothered to apply instrument
    corrections to readings taken with his Freiberger, implying that it's
    not necessary to achieve accuracies better than about 1 nautical mile.
    That also seems to be the general opinion here, especially with regard
    to observations from small yachts, where it often is not possible to
    get more accurate.  But how about larger vessels?  Does anybody want to
    defend trying to get accuracies closer than 1 mile?

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