All compasses in the world need to be recalibrated when the magnetic poles reverse. So many people, I don't know if you know or don't know, but certainly Boy Scouts and Girl Scouts knew this. Accompass points north. But it doesn't really. It points to Earth's North magnetic pole, which is not in the same place as Earth's north pole with Santa lives. The closer you get to where that North magnetic pole is, which is somewhere lost in the northern islands of Canada,. If you are north of the North pole, magnetic pole, it'll point south. That's where the white walkers are.