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    Compasses
    From: Martin Gardner
    Date: 2002 May 29, 06:44 -0700

    I was on a boat over the weekend with both a binnacle compass and a
    fluxgate.
    
    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?
    
    Martin
    
    
    

       
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