Originally Posted by Chrisgo
Honestly, it's been explained to me many times, and I don't get it either. Seriously. Not trolling.
The earth rotates around the barber pole next to santa's workshop.
- True North always points to the barber pole no matter where you are.
The north pole of earths magnetic field doesn't line up with the barber pole.
- Magnetic North lines up with the direction to the magnetic field.
So your magnetic compass
doesn't neccessarily point to the barber pole.
Magnetic deviation is the difference in direction between magnetic north and the barber pole.
There's a bit more to it but that's the gist.