In large industry buildings it can be useful to track the position of working devices (robots, machines, vehicles) or goods (pallets, wares). Indoor asset tracking is the solution. The object which should be surveilled is equipped with a beacon for example and thus transmits its position continuously. If an object leaves a certain area (geofencing), for example because it is being stolen, an alarm can be triggered. This technology is also an option for hospitals, which want to determine the position of medical devices or hospital beds.