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rhumb line route The direct straight line course between two points on a mercator chart. There will be a constant true heading to the destination at any place along the route, although the magnetic heading will vary as the variation does. Whenever we draw a straight line between two points on a chart, that distance is referred to as the rhumbline distance, and that line is the rhumb line route. See discussion comparing to great circle route at the end of that discussion.

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