Interesting project and seems they've put a lot of work into it. I wish, however, that projects like this wouldn't use words to describe their performance ("High-precision") that are only meaningful given a user's intended application(s). For example, whether using a bluetooth RSSI technique for localization is considered "high-precision" depends completely on the user's intended application and the other components present within the system, including hardware and the environment (both of which could be uncontrollable).

Incidentally, the name of the project does a good job at capturing exactly what it is, "Framework for Internal Navigation and Discovery".