If you don't need to 'look at a map' to tell you where to go then you probably have a mental map.
Explanation:
Once an individual gets acquainted with a certain place, the features, landmarks, significant spots, roads, etc. of the place become familiar to him.
His brain has a navigational map automatically generated of the places that are familiar to him. This kind of map that is formed in one's brain is called a 'Mental Map'.
