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Keywords: Mercator and straightened rhumb.png en A rhumb line at 45 degrees to meridians is transferred from sphere to the the plane chart equirectangular projection The parallels are adjusted upwards to give a straight line as for the Mercator projection own Peter Mercator 2010-02-07 Mercator and straightened rhumb svg cc-zero Equirectangular projection Mercator projections Loxodrome Diagrams labelled with numbers only |