Topographic maps are drawn to true north (North Pole), which is indicated by the grid lines on the map. However, a compass will always point to magnetic north, which is in the Hudson Bay area. The difference between true north and magnetic north is called “declination.”
When true north and magnetic north are aligned, you’re at zero degrees declination. Your compass needle will point to true north. However, if you’re east or west of zero degrees declination, your compass will not be in line with true north.
To compensate for declination:
Topographic maps are available
at many outdoor stores or may be ordered from:
U.S. Geological Survey
Branch of Distribution
P.O. Box 25286
Denver, CO 80225
National Forest Service Travel Maps show forest road networks and restrictions.
They are available from the U.S. Forest Service.