Navigational gear worldwide
I'm not that well travelled (never been outside of Europe!) but at some point I'd love to head elsewhere to perhaps hike somewhere a bit more exotic.
I've heard (quite a bit) that most compasses only come calibrated for one hemisphere - how much "out" is a compass in the wrong part of the world? Is it generally no more than a few degrees, or potentially completely wildly out?
Following on from this, can I get a compass that does work pretty much worldwide to save the hassle of swapping back and forth between them, or is it just a case of always the right compass for the right place?