For my final year project at McGill, I worked with Mathieu Perreault (@madmath) to build a iPhone application combining basic elements of augmented reality with navigation. The idea was that we were building a front-end navigation program to direct the user to a nearby available parking spot. We did not have an actual database of parking spots, though other teams have worked on that problem for their projects, so ours simply relied on the user selecting a rough destination of where they wanted to go, and then displayed a turn-by-turn instructions to get there. The user then had the option to use a 2D map view to follow the path, or a '3D' view by assuming the camera is facing out the windshield, and superimposing an arrow on top of the video feed.