Abstract: A method of controlling a navigation system is provided which builds up historical information of routes taken by a vehicle and uses this information to provide an appropriate route for the vehicle based upon deviations from suggested routes stored upon a mobile computer unit of the navigation system of the vehicle.

Abstract: A method of controlling a navigation system. Navigation systems which are capable of gathering historical information concerning routes taken by a number of individual vehicles are known. Such systems rely on a central database to analyse and store the historical information of all the participating vehicles. The central database can therefore suggest an improved route to a vehicle based on the analysis of the information gathered from the participating vehicles. However, as the central database analyses historical information received from a number of different types of vehicles (e.g. delivery trucks, taxis, motorbikes etc.), the routes suggested by the system are often inappropriate for a specific type of vehicle. For example, a route which is appropriate for a motorbike is often not appropriate for a truck, and vice versa.