Every one in the army is taught Land Nav. Not everyone learns it. But, assuming you learned it at a minimal proficiency, then you should know how to shoot back azimuths and determine 8 digit grid coordinates. Here in the civilian world, they decided to play a nasty trick on us and change it all, well most of it. Civilian maps are a little different, and their grid coordinates are the biggest difference. Before I wonder off my point too far, if you want to do some of the same basic land nav you did in the army, then you will need a compass that can do it. Other wise, if all you need to know is where is north, any compass will do.