Abstract: A system for determining a user's path is described. The system comprises a location server arranged to receive location data of a communication device associated with the user, the location data defining the detected position of the communication device at a number of different points in time, the location server further arranged to receive sequence data associated with the location data indicative of the order in which the location data was determined; path determining means for determining the user's path passing through points defined by the received location data and the associated sequence data; and a comparator for comparing the determined path of the user with one or more predetermined user paths; wherein the location server processes the received location data depending upon the result of the comparison and corrects the determined user path with the processed location data.