Saw this on "Survivor Man" with Les Stroud in Africa. It's a technique he said comes from the military.
You find yourself in an area and without a map. As you walk around, you draw a map showing all the major landmarks. But, instead of trying to figure out distance, you write down how long it takes you to walk from one landmark to the next.
Anyone used this, been trained in it, etc.? How useful did you find it?

