Sung-Hyun Jang, one of my Ph.D. students here at CASA, has launched an Android app called AR Navigation System for Pedestrians.
The app is a part of his Ph.D. studies, and is an attempt at visualising geographic information via an augmented reality interface. Specifically, the app provides navigation information via both map interface and an augmented reality interface.
You can learn more about app at http://www.pinenutapps.com/
The app is available at Google Play. (https://play.google.com/