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    Re: Navigation News book review on Earth's magnetism.
    From: Frank Reed CT
    Date: 2005 Oct 10, 02:31 EDT

    "Jonkers has taken magnetic information from  many European logbooks and
    sailing directions between 1500 and 1800. One of  his observations is that
    there's a scatter in measurements of magnetic  variation, with a standard
    deviation of about 2.5 degrees."
    
    A problem  with this sort of analysis, of course, is that it's dependent on
    knowing the  vessel's actual position. Before 1800, that's usually only
    possible at known  landfalls.
    
    And for those who haven't seen  it:
    http://www.HstoricalAtlas.com/mag/
    
    -FER
    42.0N 87.7W, or 41.4N  72.1W.
    www.HistoricalAtlas.com/lunars
    
    
    

       
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