Abstract: A navigation apparatus includes a processing resource that is operably coupled to a data store including digital map data. A location determination unit is also provided and capable of determining a location. In at least one embodiment, the navigation apparatus receives information from at least a vehicle: steering sensor for sensing an angular position of the vehicle steering control. Information relating to the sensed parameters is logged by the navigation apparatus while driving. Upon subsequent uploading of the information to a server, the information is analysed statistically, and combined with similar information obtained from other navigation devices. The statistical analysis enables supplementary road information to be derived, such as road lane width; Such supplementary road information is added to the digital map to facilitate greater safety awareness and route planning.