If you are really lost, an ordinary compass will not save your life, you are as good as dead. Only an official battle tested military compass will save your life. What does battle tested mean? Oh not much, just shock tested, meaning they licked a battery and touched it to the compass and it still worked. Water tested, meaning they dunked it in some water and it still worked. Sand tested, meaning they threw some sand at it and it still worked. Temperature tested, meaning they put it in a refrigerator and it still worked, and put it in an oven at a slow broil, moistening once every 10 minutes and it still worked.