A Rhumb Line (also known as a loxodrome) is a line on the earth's surface that crosses all meridians at the same angle. It is used as the standard method of plotting a ship's course on a chart.
This constant course or line of bearing appears as a straight line on a Mercator projection chart. Because it crosses all meridians at the same angle, a course line remains constant.
This is unlike a 'Great Circle'. A Great Circle is the shortest distance between two points on the globe but the line drawn between those two points is a constantly changing course line.
The Rhumb Line for Great Lakes Sailing is clear: to provide a comprehensive listing of ports around the Great Lakes basin and articles that cover a broad range of topics of interest to sailors.
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