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    Re: Mag. Variation
    From: Dan Hogan
    Date: 2004 Feb 24, 10:28 -0800

    I don't know how Mag. Variation was calculated, if it was, in the17th and
    18th centuries. But I was tutored by a Merchant Marine Captain from the
    days when they had to supply their own navigation supplies, He used
    "Compass Error", the difference between the calculated azimuth of the body
    and the compass bearing of the body. He did not plot on charts, but
    calculated his position.and marked that on the chart.
    
    Dan Hogan
    dhhogan1---.net
    
    
    

       
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