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Variation
Information
As stated in the topic on magnetism, Earth has magnetic properties and
can be thought of as having a powerful magnetic bar near its center.
The lines of force appear as illustrated in figure 2-3.
Facts
Figure 2-3. Chart No. 42 showing lines of variation.
Earth’s magnetic properties are not uniformly distributed.
Earth’s magnetic poles are not at the same position as the geographic
poles.
Magnetic lines of force are called magnetic meridians.
The variation for any area on
Earth is always equal to the
difference between the value of
true north and magnetic north.
Example:
True north
000°
Mag. north
358°
Variation =
2° East
2-4
Figure 2-4. Variation equals the
angular difference between true north
and magnetic north.
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