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.