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    Re: Old charts and traditional navigation methods
    From: Bill B
    Date: 2014 Aug 13, 02:54 -0400

    On 8/12/2014 4:56 PM, Jackson McDonald wrote:
    > I have attached three photos of a French nautical chart dated 1771.
    >
    > Like many old charts, this one contains numerous diagonal lines in
    > addition to lines of longitude and latitude.
    >
    > How were these diagonal lines used?  How did they help a navigator plot
    > his ship's course?
    
    LORAN D- ? :-)
    
    

       
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