The report offers methods for developing an indoor navigation system. For this purpose, popular navigation applications have been analysed. We have been strongly motivated by the fact that no universal methods have been established that are applicable with this kind of projects. Very often the case is that new methods are formed in view of a specific process and they are based on a particular technology and on the related organisation, design and other considerations. This is also confirmed by a conducted experiment with a commercial product for indoor navigation. The methods offered include map digitising, determining a user’s location, and selecting the shortest path. This is achieved by applying elements of graph theory, databases, XML and QR code. The methods offered are universal and could be applied to any type of building. The methods have been approbated in the building of a mobile application for the needs of the University of Mining and Geology, Sofia.