I still carry TWO silva compasses. Second one comes into play when you think you know way out so you assume compass must be broken. When both compasses agree you have confidence to rely on them. I got turned around in north Maine once deer hunting and was sure compass was wrong but followed them. Two hours later came out onto road right where I was suppose to be. Twenty years later I am still surprised I got that turned around. If I go farther into woods than I can crawl back I have two compasses and overnight survival kit