Indoornavigation for a library Janek Stoeck and Harald Sternberg HafenCity University Hamburg Abstract. To find the optimal way to a destination without the help of appropriate tools is sometimes not particularly easy or even impossible. This is also the case in the HafenCity University Hamburg (HCU) library in Hamburg. Due to the inhomogeneous signatures of the books, it is not possible to make clear assignments to specific subject areas here. This is due to the fact that the current collection has been brought together from several old collections. To simplify this situation, an indoor navigation system based on smartphone sensors is currently being developed. Acceleration sensors are used to realize a step counter. In combination with gyroscope data a dead reckoning can be carried out. The height information is derived of barometric measurements. For additional support, routing graphs are used to constrain the walking direction. Keywords: indoor navigation, indoor localization, dead reckoning, routing, topological support 1 Introduction Automatically locating people in real time inside buildings is a challenging task. There are many technologies that can be used to enable real-time localization (WLAN, Bluetooth, Ultra-Wide-Band etc.). In order to realize complex applications, custom developments with infrastructure-based positioning methods are more complicated to realize, especially when it comes to linking several disciplines. This is where systems that the user already owns, such as the widely used low-cost multi-sensor system smartphone, are ideal. It combines sensor technology for tracking objects, as well as many advantages of modern computers in a portable handy device. Such a complex application is also presented in the following project. In this project a navigation from the current location to a searched book in the library of HCU shall be ofered. The reason for this is an inhomogeneous signature indication as well as a not intuitive description of the location of the book. For this purpose, the book search is to take place on the smartphone with the website ofered by the library. Afterwards the way to the book is to be represented on a map. Here, the presentation of a website, extraction of desired data, linking to a database containing information between semantic and topological information of the book, localization and tracking of the smartphone and presentation of the route and the environment on a map are used.