Rhumb line
Arc crossing all meridians of longitude at the same angle
Rhumb line
In navigation, a rhumb line (also rhumb () or loxodrome) is an arc crossing all meridians of longitude at the same angle. It is a path of constant azimuth relative to true north, which can be steered by maintaining a course of fixed bearing. The rhumb line is, in general, not the shortest route to the destination; that is given by the great circle. However, it is possible to follow a rhumb line using only a magnetic compass (accounting for the magnetic declination) or a celestial determination of true north. The course of a rhumb line is given by a straight line in the Mercator projection. This is a defining property of this projection.
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