I have a button compass that I wear on my watchband. Same compass and setup I used when I was diving. I am familiar with mapping and navigation with both the lensatic and the baseplate compasses, and have made several rough maps. It's a skill I'm always glad to have in my back pocket, and sometimes use the principles just in my head to work out what is going on.

But in actual practice, I really only use the compass to orient my map. If I need to do it and worry about declination, I have degrees marked on the rim.

But let me second something above. For careful use, I have to get the compass away from my watch. The watch throws the compass off about six degrees.

Good luck, best, jcp