If a certain feature--a mountain peak, for example--is at a compass bearing of, say, 232 degrees, you can draw a line from that feature on the north-oriented map at an angle of 232 degrees and know that you are somewhere on that line. In navigation, this is called a line of position, or LOP. But you don't know where on that line you are until you shoot another bearing, preferably at a feature between 60 and 120 degrees from the first one. When you draw the second LOP, extend it far enough so it crosses the first one. Where the two LOPs intersect is your "fix."