The idea of the proposal is to develop a real public transport navigation system based on mobile devices that give passengers the possibility to act as they are used to do with common navigation systems in their cars. Once entered the destination of their trip they will be able to get into a vehicle and to jump off/on as often as they like to. The system will always guide them to the destination. Passengers are not longer bound to a printout of the route. They may change and interrupt their trips as often as they want to. To put this into practice, existing studies about the Galileo satellite system, about navigation, and about mobile applications from former projects and several sources will be analysed and put together with user needs and general conditions into a meta study, the technical developments of the project will be based on. The focus of the project will be the development of all necessary applications for the passenger navigation system based on a business plan that is focused on a sustainable operation for all usual public transportation networks in Europe. Functional tests and demonstrations will verify the functionality of the system and the effect analysis will verify and adjust the proposed business model. Finally an evaluation and dissemination process will ensure the sustainable usability and the successful knowledge transfer from research and development to an operational service of this passenger navigation system.