I've seen it demonstrated on Nokia devices before, but it's more available to the public with an iPhone. I find it clever that they were able to circumvent one

I've seen it demonstrated on Nokia devices before, but it's more available to the public with an iPhone. I find it clever that they were able to circumvent one major obstacle of doing augmented reality. Usually, you need to interpret something about the video view from the camera in order to figure out where to place the 3D models in the scene. Instead, they rendered it entirely ignoring the scene, and just used orientation and distance to display the subway signs. That works great for cities like New York or DC, where it's pretty much a grid with no dead ends.