When travelling over terrain, keep track of the terrain features. How many times did the trail switch back? In which directions? What direction have you been travelling? What was the terrain like you just crossed? How many trails or roads did you pass? How many streams, creeks, rivers, or other types of water bodies? What was the vegetation of the terrain like that you just passed?

Keeping all of these (and more!) items in mind will help you determine your location on the map.