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  1. #1
    Administrator waldronate's Avatar
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    Maps with many sets of radiating lines are called portolan charts. http://en.wikipedia.org/wiki/Portolan_chart has a reasonable description.

    Rhumb lines are hard to do on large-scale maps unless they are in a specific projection. This projection is called the Mercator Projection and it requires relatively advanced mathematics as shown at http://mathworld.wolfram.com/MercatorProjection.html.
    Last edited by waldronate; 07-10-2010 at 06:23 PM.

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