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    Re: Manual calculation of compass variation
    From: Herbert Prinz
    Date: 2004 Oct 17, 01:01 -0400

    Borda reports (Verdun de la Crenne, Borda, Voyage fait par ordre du Roy en
    1771 et 1772) that the biggest effect on compass deviation is caused by the
    guns. The Endeavour apparently had some 20, I didn't check Cook's other
    ships.
    
    When possible, observations for variation were also taken on land with a
    chance of better accuracy. For a land observation, I don't find a
    specification of minutes unreasonable. On a compass rose of 15cm diameter one
    can easily read 1/4 degrees, so that an average of 3 measurements would
    result in a nominal accuracy of 5'. At least, this was the reasoning.
    
    Herbert Prinz
    
    
    

       
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