The invention deals with a compass and methods to detect the spatial direction of the predominant amount of free magnetic flux. The invention declares that it can be implemented by PMs (6, 7) on a flat plane with the possibility of rotation in three basic ways. In the first way, two PMs are used and they are rotated mechanically by 180° toward the main Earth's magnetic north. The second method implements two PMs where a freely moving PM is mechanically turned away by 180° from the main magnetic north and the fixed PM is simultaneously turned by 180° toward the main magnetic north. The third way uses 3 PMs, one movable PM (7) and one fixed PM (6) and their so-called mechanical 180°C turn to the Earth's main magnetic north and a simultaneous 180° turn of the other movable PM away from the Earth's main magnetic north.