# How to know how much overshoot/undershoot the compass if you're flying close to one of the poles; is it even needed?

As far as I understand, the formula (1/2LAT + 15°) is not applicable when flying close to one of the poles or the equator.Therefore, when flying close to the poles, what happens? Does it have the same effect as when you're at the equator? Does the magnetic dip become insignificant enough so that the compass lag/leading may be neglected?

• Are you talking about VFR or IFR? If IFR with no directional gyro, you normally do timed turns. Commented Jul 15, 2022 at 0:34
• If you’re flying between the North Pole and magnetic north, the two will differ by 180 degrees. Also, the magnetic South Pole isn’t diametrically opposed to magnetic north; there’s no simple formula
– Frog
Commented Jul 15, 2022 at 8:27
• If you're flying really close to the magnetic poles, the compass becomes fairly useless anyway. In the far north you fly by true headings and tracks. Commented Jul 15, 2022 at 15:04