The university campus of NUI Maynooth forms a substantial part of Maynooth town. Location based services (LBS) could be important for visitors to the campus and town in assisting them to make the mast of their stay, particularly if they are not familiar with the town. In this paper we discuss an LBS application for Maynooth university campus and Maynooth town based on OpenStreetMap. The solution uses open source software and public participation rules to build its database. The work provides a prototype LBS system for NUI Maynooth which is currently under active development. The paper mainly describes some completed components of the work: data acquisition and pedestrian navigation algorithm design. Future work on path optimization and 3D applications is also discussed.