in part with the exemplary embodiments described above in connection with the first embodiment a detailed description has been made of the fusion of sensor data in particular the fusion of navigation satellite signals with vehicle and or surroundings sensors and traffic telematics receivers which enables the quality and accuracy of position determination to be increased and a dead time of a navigation device or a navigation satellite signal sensor to be bridged with the approach described in this exemplary embodiment the vehicle system can even produce the adas horizon without any navigation device and map basis at all in this case this exemplary embodiment is described with reference to fig2 in this exemplary embodiment the map matching module 29 is designed in such a manner that it can supply the necessary input parameters to the adas horizon provider 22 even if no digital map is available this means if there is a digital map as described in the first exemplary embodiment the method described below can be used to corroborate the map data or achieve a redundancy for this data for example to detect and be able to correct errors this fusion leads to better availability and quality of the adas horizon and to a redundancy for the adas horizon on the basis of digital maps thus increasing availability and safety since the fusion of both sources enables an improved adas horizon to be achieved as has already been explained above in connection with the first exemplary embodiment this fourth exemplary embodiment goes a step.