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.
Newro@Genesis 🤔 I am aware of the magnetic field being different around the world, and in fact constantly changing, which is why charts have magnetic divination for the area and year (f.e. add 10 + 1 per year after 2015) printed on them.
Additionally we need to adjust for vessel.
First time I read that the magnet in the compass itself also have to be different. I assume all the nautical ones will be global by default.