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9.6.1.1 Compass North (CN)
The direction the magnetic needle points is
called compass north (CN).
Since magnetism is very individual from
aircraft to aircraft, its effect must be
determined for each individual aircraft.
9.6.1.2 Deviation
The misalignment that can occur on the magnetic compass due to local
disturbing magnetic influences, e.g. electrical
equipment or metal parts, is called deviation.
It is called + or east when the magnetic needle points
east of the direction to magnetic north (MN).
Correspondingly, the westerly direction is called ÷ or
west.
9.6.1.3 Deviation table
With the magnetic compass installed in its permanent place in the aircraft, an
aircraft mechanic makes a deviation determination and possibly a compensation
on different courses, as the influence also varies according to the aircraft's
direction.
Despite this compensation, there will still be a
residual deviation, which is recorded in a
deviation table or curve, like the one on the
right. The table is situated near the compass.
The deviation table shows what to steer (CH)
on the compass for a specific magnetic heading (MH).
When CN is to the right of MN, the deviation is +. To the left, the deviation is -.
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 837
