Since last edition of FOSDEM, different volunteers have been working to create an indoor map of FOSDEM, complete with routing for wheelchairs/accessibility/... This map is available at https://nav.fosdem.org/ . It is created using C3NAV, an application built for the Chaos Communication Congress. In this application I want to focus on the application, how the map was built, why plain Openstreetmap was not sufficient, but especially I hope to get some feedback: where could we improve, how can we improve integration with OSM/other applications/...

Please not that this talks replaces the talk "3D OSM Plugin API for ESA-NASA Web WorldWind" because unfortunately the presenter could not get a travel permit.