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    Re: digital compass, etc
    From: Aubrey O´Callaghan
    Date: 2000 Sep 11, 9:52 AM

    I've got a Furuno electronic compass on my boat (connected to the radar).
    This is swung by turning the boat slowly thru 360 degrees.  I also have a
    autohelm 3000 autopilot this is swung in a similar manner.
    Except that in the autohelm it is necessary to then point the boat on a
    fixed bearing and remove any offset in the deviation.
    This is not necessary with the Furuno compass. How can the Furuno "know"
    any offset ?
    At 08:39 AM 07-09-00 -0700, Patrick McVey wrote:
    >I don't mind though slightly off subject. You're doing what's called,
    >"swinging the compass." The sensor (fluxgate I believe) and microprocessor
    >are testing the sensitivity of all 360 degrees and making a correction
    >table for each point of the compass (probably all 360 points). The
    >sensitivity varies due to large pieces of

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