16. Before we can begin to really use a map, we need to orient the map to reality. This can be done without a compass if you can recognize your position and can also recognize some prominent features in reality that also appear on the map. There are two ways to orient a map using a compass. Here, the compass is set so the yellow line is above the black line. The compass is then set on the map mark showing the 13-degree declination. Next, the map and the compass are both rotated until the north arrow lines up with the overlaid yellow and black lines. Now we've got the map pointing correctly at both true north and magnetic north.