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In practice, we use whole degrees when making calculations. Whether you
should round up or down depends on whether you are west or east of the isogon.
9.5.4.3 Agonic line
o
The line that passes through places with a variation of 0 is called an agonic line.
You can test your skills on the variation calculator here.
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9.6 The influence of magnetism on the aircraft
Every aircraft is subject to various disturbing magnetic forces, originating from,
for example, live wires and radio installations.
This magnetic influence on the aircraft will pull the magnetic needle away from
the direction towards magnetic north.
9.6.1 Deviation and compass north
Magnetic fields near the compass can affect the direction the compass needle
shows, and thus not point towards magnetic north.
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 836
