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    Re: Fluxgate compass
    From: Brian Whatcott
    Date: 2002 Jan 29, 5:34 PM

    At 05:16 PM 1/29/02, you wrote:
    >... What exactly
    >is a bolt-down sensor? And what errors does it "abolish"?
    >As I understand it, a fluxgate compass, like any other compass, needs to
    >establish the direction of the horizontal component of the Earth's field,
    >with respect to the direction of the vessel. For this to happen, somehow
    >the fluxgate compass, just like any other compass, has to be aware of the
    >direction of the horizontal. ...
    >George Huxtable.
    George, the comments I posted were on the basis of examining the
    constructional details of a fluxgate.   In view of your praiseworthy
    efforts in describing the Lunar, I'll try to return the favor by taking
      a look at what the commercial fluxgate offerings provide.
    It may be that for a 2-axis fluxgate, a pendulous mount might be adopted.
    This would retain the pendulous errors associated with a compass card
      of the conventional kind. I'll get back to the list, if I find useful
    engineering input.
    A three axis fluxgate can be mounted rigidly. This is sometimes called a
    'bolt-down' sensor.
    Brian Whatcott
       Altus OK                      Eureka!

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