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Figure 4.2-7 Track
CONVERTING FROM TRUE TO MAGNETIC
Because the Lambert conformal chart is referenced (via the meridians) to True north lines
drawn on them are True directions. The heading systems in all aircraft are referenced to
Magnetic North. In order to fly the course, it must be converted from a true course to a
magnetic course. This is accomplished through the use of magnetic variation.
VARIATION
Lesson Topic 4.1 discussed how cockpit compass systems are referenced to the magnetic
lines of force (Magnetic North). The Magnetic North Pole is located in northern Canada
near the Hudson Bay, far from the geographic True North Pole (Figure 4.2-8).
Variation is the angular difference between True North and Magnetic North from any given
position on the earth's surface. Variation is expressed in degrees east or west.
4.6-26


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