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    Re: Fluxgate compass /benefits of 3 axis
    From: Rodney Myrvaagnes
    Date: 2002 Feb 1, 11:07 -0500

    A practical but incomplete solution is found in some higher-end autopilots 
    (which i haven't used myself). But Sally Lindsay and Stan Honey won their 
    division in
    the Pacific Cup with the Cal 40 Illusion, using a below-deck tiller pilot 
    (Robertson, IIRC) Sally said they could adjust rate-of-change damping 
    separately from first-
    order sensitivity. By retarding the rate response they kept the autopilot 
    working under spinnaker for the 3,000 nm trip.
    I think this is making the autopilot use its compass in a longer time-constant 
    averaging mode, which is of course what a human helmsman tries to do.
    But, George is absolutely right that you can't separate signals at the same frequency.
    On Fri, 1 Feb 2002 15:47:03 +0000, George Huxtable wrote:
    >This isn't too serious if the compass is simply being used to
    >measure the average course, as long as there are landmarks around us which
    >we can watch to maintain a short-term heading. The problems occur when we
    >want to feed the compass information immediately back to the steering to
    >try to maintain a steady course.
    Rodney Myrvaagnes                   J36 Gjo/a
    "A balanced diet is a cookie in each hand."

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