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    Re: Compasses
    From: Brian Whatcott
    Date: 2002 May 29, 18:12 -0500

    A fluxgate of the usual ('2D') kind has a suspension that is quite comparable
    to that of the regular compass. The suspension is intended to keep
    it reasonably level in quiet weather conditions.
    Fluxgates will give a consistent offset if not initially aligned, despite auto
    deviation correction methods.
    Swinging the fluxgate would give you the necessary insight.
    Brian Whatcott
    At 08:44 AM 5/29/02, you wrote:
    >I was on a boat over the weekend with both a binnacle compass and a
    >After removing the canister airhorn from the drink holder and watching the
    >binnacle compass swing 20 degrees, there was still a 10 degree discrepancy
    >between the binnacle and the fluxgate.
    >Fluxgates may be off the charter of the list: if so, please reply privately.
    >My question:  any ideas?  The binnacle had a deviation card showing no
    >errors, and it agreed pretty well with a handheld. The fluxgate was mounted
    >below, maybe three feet from the refrigeration compressor, not near any
    >other obvious stuff.
    >Are fluxgates subject to the same deviation error sources as real magnets?
    Brian Whatcott
       Altus OK                      Eureka!

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