That might sound silly, but there might be an element of truth in the idea after all.
In NA the magnetic field is tilted downwards, because you are closer to the N pole. In Oz the magnetic field is tilted upwards, because we are nearer to the S pole. Now, with cheap button compasses this should not really matter, because the pivot point is high on the needle wrt the length of the needle, but who knows?
Indeed, I have one good compass for Australia and a different one (bought over there) for Europe, for this reason.
Cheers

