From an article on Mental Floss called Is Your Sense of Direction Innate?
A GPS may save your behind now and then, but it may meddle with your navigational skills if you depend on it to get everywhere. We naturally get around by using a process called “dead reckoning.” Basically, you estimate where you are by comparing your location to a reference point. You use a mental map to make these estimates. Problem is, when you rely on a GPS, that mental map can get foggy.