The application, based on wireless in-building information devices (beacons), generates appropriate text messages, which are automatically converted into voice messages using a speech synthesizer (in Polish and English) when the device is near the beacon. Thus, GIERMEK guides the user to the destination along the optimal path in a given building / storey. After making a change from the default input state to the output state, the application directs the user to the optimal way to exit the building. GERMEK also has an evacuation mode, which, when triggered by the administrator, informs users about the need to evacuate the building and helps to leave the building in the fastest way, leading the shortest way to the exit.