Need help! Magnetic Compass Errors!

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

On Jan 1, 11:18*am, wrote:
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

I should have added that at high latitudes, where the dip is
severe, the compass is not accurate and isn't used. In northern Canada
we have the Area of Compass Unreliability; see
http://gsc.nrcan.gc.ca/geomag/field/compass_e.php

In this area pilots may use the sun's true bearing tables, which give
a direction based on an accurate time. Of course, most rely on GPS...

Dan