Part 2 is describing how to use a line of sight you take with the compass, to find your position. It's a more accurate method than used in the first
article, as it does not rely on your body being at a certain landmark.
Part 3 describes how to tie up part 1 and 2, and use them for navigation sort of like the non-lensatic guide. I recommend you use the simple compass
first, then move up to a lensatic compass.
I usually use the position of the sun, and some in head mathematics. or the constellations in the night sky in relevance of where I am, to figure out
where I am and going. Yay for science. I do not need a compass, although they do come in handy
That method is good for finding things large, like the east coast. Using a lensatic compass for navigation can get you on something as small
as a parked vehicle if you're good enough.
If you're in the wilds - find yourself lost - then pull out your compass and map...it's already too late. Start with the compass and the
map......and a watch.
Reading a topographical map is taught to every child that's gone through middle school. It's actually required learning. Some may need a
refresher though.