Method for operating a navigation system of a vehicle in a cellular network wherein the navigation system comprises a navigation module adapted to receive GNSS-Data from satellites and a mobile radio module adapted to receive GNSS-correction data from ground stations in a cellular network, - wherein the navigation system is provided with GNSS-correction data via the cellular network, - wherein the GNSS-correction data are transmitted in a first subset of cellular cells (1.1, 1.2) of the cellular network according to a first routing method in a network slice as unencrypted data using broadcast and wherein the GNSS-correction data are transmitted in a second subset of cellular cells (2.1, 2.2) of the cellular network according to a second routing method as encrypted data using unicast, characterized in - that the navigation system of the vehicle has access to a database which contains information regarding the properties of the cellular cells (1.1, 1.2, 2.1, 2.2) of the cellular network, said information being related to a landscape in a way that the navigation system is able to calculate which cellular cell (1.1, 2.1, 2.1, 2.2) will be entered next while travelling on a given travel route; - wherein the navigation system performs a comparison between a calculated travel route of the vehicle and the information regarding the properties of the cellular cells (1.1, 1.2, 2.1, 2.2) of the cellular network and - wherein a connection to the cellular cell (2.1) which follows next to the currently connected cellular cell (1.2) on the travel route of the vehicle is established independently of any handover rules of the cellular network if the cellular cell (2.1) which follows on the calculated travel route to the currently connected cellular cell (1.2) belongs to another subset of the cellular cells (1.1, 1.2, 2.1, 2.2) than the currently connected cell (1.2) then the establishment of the connection of the navigation system to the following cellular cell (2.1) is being initiated when the vehicle by enters a transition zone which is geographically defined. - wherein the navigation system is provided with GNSS-correction data via the cellular network, - wherein the GNSS-correction data are transmitted in a first subset of cellular cells (1.1, 1.2) of the cellular network according to a first routing method in a network slice as unencrypted data using broadcast and wherein the GNSS-correction data are transmitted in a second subset of cellular cells (2.1, 2.2) of the cellular network according to a second routing method as encrypted data using unicast, characterized in - that the navigation system of the vehicle has access to a database which contains information regarding the properties of the cellular cells (1.1, 1.2, 2.1, 2.2) of the cellular network, said information being related to a landscape in a way that the navigation system is able to calculate which cellular cell (1.1, 2.1, 2.1, 2.2) will be entered next while travelling on a given travel route; - wherein the navigation system performs a comparison between a calculated travel route of the vehicle and the information regarding the properties of the cellular cells (1.1, 1.2, 2.1, 2.2) of the cellular network and - wherein a connection to the cellular cell (2.1) which follows next to the currently connected cellular cell (1.2) on the travel route of the vehicle is established independently of any handover rules of the cellular network if the cellular cell (2.1) which follows on the calculated travel route to the currently connected cellular cell (1.2) belongs to another subset of the cellular cells (1.1, 1.2, 2.1, 2.2) than the currently connected cell (1.2) then the establishment of the connection of the navigation system to the following cellular cell (2.1) is being initiated when the vehicle by enters a transition zone which is geographically defined.