Definition
A cylindrical conformal projection in which meridians are equally spaced parallel straight lines and parallels are spaced increasingly with latitude in proportion to the secant of latitude. Its defining property is that a rhumb line plots as a straight line, so a course can be laid off with a single protractor angle. Scale is true only along the equator or the chosen standard parallel and grows without limit toward the poles, making it unusable above roughly 70 to 80 degrees.
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