Everything would be fine if whoever built this planet had taken the time to align the magnetic north pole with the true north pole. Unfortunately this planet appears to have been a rush job and it is necessary to adjust for the error.

The Earth’s rotation and iron core create a magnetic field much like giant magnet. However the ends or poles of the magnet do not match the Earth’s geographic poles. To make things worse, the magnetic pole tends to wander or drift, so its location can change over time. Fortunately the drift is minor, and not significant for wilderness navigation.

The difference between the true north pole and the magnetic north pole is easily corrected. Simply add or subtract the difference between the two. For example in the Canadian Rockies the magnetic north pole is about 20 degrees east of the north pole. This is called magnetic declination. If you use your compass to find a bearing of a mountain and it is 270 degrees, you have the magnetic north bearing. Maps are made in relation to the true north pole unless otherwise indicated. So the bearing on the compass is different than the indicated map bearing. To correct take the 270 compass bearing and add 20 and you have 290, the map bearing. Conversely a map bearing of 270 degrees must subtract the magnetic declination to determine the compass bearing.

In other words:

Compass Bearing + Magnetic Declination = Map Bearing.

Map Bearing - Magnetic Declination = Compass Bearing.