Abstract: A method and system for transmitting data via a transmission pathway between a tachograph, which is disposed in a vehicle, and a data processing facility, which is at a distance from the vehicle. Data is transmitted wirelessly via at least a partial section of the transmission pathway and the tachograph is connected to a GSM module and/or a module for wireless data transmission The method includes producing a connection for wireless transmission between the GSM module and/or the module for wireless data transmission and the data processing facility, instructing the tachograph by the data processing facility to receive specific data; authentically the data processing facility and/or the tachograph transmitting specific data to the tachograph.