Page "Magnetic declination" Paragraph 11

** On some maps intended for wilderness or navigational use, including the topographic maps of the U. S. Geological Survey ( USGS ), a diagram shows the relationship between magnetic north in the area concerned ( with an arrow marked " MN ") and true north ( a vertical line with a five-pointed star at its top ), with a label near the angle between the MN arrow and the vertical line, stating the size of the declination and of that angle, in degrees, mils, or both.

( On USGS maps, the diagram is near the lower left hand corner, and the information labelled " GN " ( grid north ) in the same diagram is irrelevant to this discussion.