www.desertmapandaerial.com

The magnetic needle in a compass is attracted by the magnetism of the earth...

Magnetic North (MN) is about 800 miles south of True North (TN), the North Pole. The angle of difference is called magnetic declination (variation) and varies from place to place. Topographic maps include diagrams which indicate the angle of difference between True North (*=True North) and Magnetic North (see below left). When using a compass and map, you must train yourself to compensate for declination using one of these options:

Add or subtract the degrees of magnetic declination provided from the map.

Extend the MN line of declination diagram in the map margin. Draw lines parallel to the extension line, approximately 2" apart. Using these lines, the map and compass now reference the MN.

Purchase a compass with Geared Declination Correction that allows you to set and leave your degree setting.

• «« Start
• « Prev
• 1
• 2
• Next »
• End »»