Millions of international citizens make decisions with and navigate using mobile phones, as GPS-enabled smartphone devices have become increasingly available to the general public. Along with this increasing use comes concern that we are losing spatial skills, which are vital to making our way around and solving spatial problems. This talk will discuss potential ways to balance the use of our brains and technology as we navigate through the world. How should we design mobile map systems that effectively and efficiently get us to our destination, while preserving our cognitive abilities? Specifically, we will discuss the impact of display design on navigation and how we should adapt mobile navigation assistance devices to individual users and contexts.