On Jan 1, 9:46*am, Stefan wrote:
Karl-Heinz Künzel schrieb:

http://en.wikipedia.org/wiki/Aircraft_compass_turns

Did you read this article? It explains exactly nothing.

A better one:
http://pilotsweb.com/navigate/compass.htm

And a better layout of the magnetic lines of force that cause compass
errors:
http://www.geology.ohio-state.edu/~v.../xfig25_14.jpg

Because the lines of force are not parallel to the earth's surface
except near the equator, anytime we tip a magnetic compass's card its
magnet will want to point downward toward the earth's core. If its
level it's pretty accurate. So in turns or during acceleration or
deceleration, the card tips and the magnet points elsewhere than where
we'd like it.

Dan