If you need to find your current location on a map, the first criterion is to visually identify a landmark in the field that you can also locate on the map, such as a mountain peak, river bend, or radio tower. First, hold your compass in a level position with the direction of the travel arrow pointing precisely at your landmark. Then rotate the bezel so the magnetic needle and the red orienting arrow underneath are lined up. A compass with a sighting mirror is designed specifically for this task. Next, set your compass on the map with the edge of the baseplate intersecting the distant landmark and the direction-of-travel arrow pointing in that same direction. Keeping the edge on that point, pivot the entire compass on the map until the parallel orienting lines align with the north-south lines of the map. The north symbol on the compass bezel will also point due north on the map. Finally, draw a line along the edge of your compass, beginning at the landmark. You are standing somewhere along that line. Take another bearing from a second visual landmark, scribe that line, and you will be at the intersection of those two lines. A third bearing will produce a triangle, hence the term "triangulation." The smaller the triangle, the more accurate your position.