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    Re: Fluxgate compass
    From: Brian Whatcott
    Date: 2002 Jan 29, 5:06 PM

    At 12:17 PM 1/29/02, you wrote:
    >On my boat the installer of the fluxgate compasses spent quite some
    >time looking for places in the boat which were as far away from
    >metal as possible in which to install them, but no extra compensating
    >magnets were used.  Of course my boat was fiberglass hulled so it
    >was not too big of a problem...
    Some more thoughts on fluxgates.   Autocorrection firmware cannot deal with
    two pathological cases:
    1) no change in magnetic field vector while the ship's head changes.
    2) an opposite change in magnetic field for some change in ship's head.
    While both of these conditions must be rare, and perhaps 2) never occurs
    in practise, it's easy to see that a diminished change in magnetic field
      direction for some particular heading change  leads to a loss of precision
      in the indication.
    Purely a theoretical speculation: three axes of measurement would provide
    a definitive value for the field. I suppose that commercial fluxgates measure
    in two horizontal axes - which still leaves room for some deviation with roll
      and pitch where the magnetic field dips, as it does in many waters of
    marine interest, I imagine.
    Brian Whatcott
       Altus OK                      Eureka!

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