The big one to look for in all of this, believe it or not, is a compass.
You CAN use any military compass that reads in 6400 mils and/or degrees but for cool factor a genuine German compass takes it.
Watch slowly and carefully and be ready to strike when one comes up.
Watch out for:
East German or Russian compasses being sold as West German. East of the iron curtain, they believe that there are 6000 mils in a complete circle where as we in the west know that there are 6400. Grab a compass that does not match your friends and watch what happens when someone gives you an azimuth!
Replica or civvy compasses. They are NOT acceptable at all. Almost all are complete and utter crap. It will not pass PCI. Back before we started hardening up on this we used to see a lot of missions blown by crap nav that all too frequently had cheap Chinese compasses at the root of the problem. You are coming to East Wind for the feeling you get when you succeed at a mission, make sure you're giving yourself all the tools you need to do that.
BGS (Bundesgrenschultz or border guards) Bezard compasses. These are VERY nice compasses but since the BGS never deployed and always operated in the same area, they have "fixed" the true north vs magnetic north issue by adjusting the scale on these to match the inter-German border. In short, while quite nice, they are not accurate in our area of the world.
It seems like a weird thing to worry about or look for right now, but I have sure seen a lot of West German guys running around with their hair on fire over compasses in February.