Genesis 
So here's a random thing that I learnt yesterday. Compasses are region-specific and the needle will "stick" if a normal compass is used in the wrong region! Australia and New Zealand are in magnetic zone 5. If you want a #compass that works anywhere in the world, it needs to have a "global needle", which is built a bit differently to account for the problem of the magnet aiming directly through the earth to magnetic north and dragging the needle down with it.
Alan@Genesis Mind blown.
Back in the 90s I worked for a computer company. We got a huge batch of (CRT) monitors all with the same weird fault, the picture was askew. Like, rotated a few degrees off square.
Turned out, they were intended for the Southern hemisphere markets. The magnetic plates that deflect the beam had to be calibrated differently.