Quote Originally Posted by Irving View Post
If you show up at an unknown location, how do you find where you are on the map? Landmarks?
Resection. Find two or preferably three distinct terrain features (natural or man-made) that you can also identify on your map. Take a back azimuth from each feature, adjust for declination, and draw the lines from the features on your map along the back azimuth. Where the lines intersect is where you are.

If you're somewhere with no terrain features, you're screwed.