Declination is the angular difference between any two norths. If you have a map and a compass, the
one of most interest to you will be between magnetic and grid north. The declination diagram (Figure
6-8) shows the angular relationship, represented by prongs, among grid, magnetic, and true norths.
While the relative positions of the prongs are correct, they are seldom plotted to scale. Do not use the
diagram to measure a numerical value. This value will be written in the map margin (in both degrees
and mils) beside the diagram.
COMPASS DECLINATION DIAGRAM
