Over the years I have bought lots of cheap small button type compasses. After a while, about 80 percent develops a bubble or for one reason or another loses accuracy. There is one type manufactured by Recta that is perfect. I’ve got one for about fifteen years and it still works like a charm. I’ m talking about the Recta DW.

http://www2.recta.ch/FMPro?-db=recta_pro...1&-find

When you have trouble finding this type look for shops where they sell Victorinox SAK knifes. Victorinox puts the DMT and DM models in their survival pouches and you can also buy them separately. The three models are identical. This compass is sturdy and very reliable and already has a bubble when you buy it so you can use it as a level. The dial is “glow in the dark” and has a jewel bearing. They are quite cheap although I don’t know the exact price.