If you don't use it, you lose it, and that goes for your brain's ability to navigate as well. A study out of University College in London finds that when people rely on GPS for directions, their hippocampus atrophies.
The study's author explains, "The hippocampus simulates journeys on future possible paths while the prefrontal cortex helps us to plan which ones will get us to our destination. When we have technology telling us which way to go, however, these parts of the brain simply don't respond."
The researches describe the brain as a muscle, and say when using GPS, the muscle doesn't get enough exercise.
See the full story at Live Science.