Figure 4.2-7 Track

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