REFLECTOR: Compass Calibration

[Ron Brown]

MessageI have a vertical card compass mounted in my instrument panel that has an error that I have not been able to calibrate out:

At North, It indicates 15 degrees
At South, it indicates 165 degrees
At east and west it is dead on.

If I adjust the error out at north - make it read 0, then it reads 150 when pointed south or vise versa - if I calibrate the error out at south - make it read 180, then it reads 30 degrees when pointed north.

I understand that a small magnet(s) can be mounted near the compass to help take these errors out.  I have tried this I am not having much luck in removing these errors.  

Any one have any experience in correcting these errors?

THANKS
Ronnie
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