Augmented reality in train station

I have see in the Paris (Gare de Lyon) train station a augmented reality application.

Basically it show the shops, train places, train station reception desk. The screen is touch sensitive and you have to turn the screen in the indicated direction and a video show you the path you have to follow to go to the desired place.

It works not so bad. The system is called "DirectiVision". I cannot know more about the company for the moment because the website is under construction. (a french company).

The system do not use computer vision system (I think), only a rotation sensor to know in which direction the user look at.