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    Re: Mag. Variation
    From: Brooke Clarke
    Date: 2004 Feb 23, 11:04 -0800

    Hi:
    
    I have seen the terms "Soft Iron" and "Hard Iron" used with reference to
    calibrating a magnetic compass, like is used in a car.
    
    I think "Hard Iron" implies that the iron is acting as a magnet causing
    an error in the indicated compass bearing that's independent of the
    heading of the car.
    
    I think "Soft Iron" implies that the iron in the car distorts the
    Earth's magnetic filed causing an error that depends on the car's heading.
    
    Can someone tell me if this is correct?
    
    Have Fun,
    
    Brooke Clarke, N6GCE
    http://www.PRC68.com
    
    
    

       
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