Discern North

Using Discern North, the caster instantly knows the direction of north from their current position, discerned from magnetic field lines. The ability does not work in space, on a planet without a magnetic field or in an area of significant magnetic interference. The caster's knowledge of north is updated only once, and the ability does not prevent the caster from losing track of where north is unless an external reference point is established or some other means of keeping track of north is established.