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    Re: Preston's paper on Lewis & Clark's Navigation
    From: Ken Muldrew
    Date: 2003 Jun 8, 00:33 -0600

    > I was referring to the average discrepencies.  Yes, there were some
    > lemons in the observations.  You also have to remember that L&C's own
    > calculation of latitude from their data, which calculations they
    > apparently made, might be better than those of Preston, since L&C were
    > closer to the data, and not using a computer (which will blindly
    > calculate with garbage that a human would discard).  Finally, perhaps
    > the "modern" interpretation of where L&C were located is incorrect.
    Many of the landmarks that they noted, as well as their excellent notes
    on courses, place them pretty well for much of their journey. I think that
    the huge errors demonstrate that they just didn't make observations a
    high priority (or perhaps they weren't trained sufficiently in the art).
    > A
    > similar phenomenon seems to have occurred with the famous Canadian
    > explorer, David Thompson, around some lake up in the Rockies.
    You may be referring to the Gottfred article where it is claimed (with good
    reason) that Thompson is actually 6 miles away from where his
    biographer puts him. This is a pretty small error compared to L&C's many
    minutes on their latitudes. Also, it seems partly due to his biographer not
    really caring very much, as her minimal notes on his navigation
    technique consist of a couple of not-too-relevant cribs from Robertson.
    Ken Muldrew

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