Magnetic-compass
noun
1.
a compass having a magnetized needle generally in line with the magnetic poles of the earth.
noun
1.
a compass containing a magnetic needle pivoted in a horizontal plane, that indicates the direction of magnetic north at points on the earth’s surface
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noun, Navigation. 1. a course whose bearing is given relative to the magnetic meridian of the area. noun 1. an aircraft’s course in relation to the magnetic north Also called magnetic heading