A controller for a route tracking system

A controller for reducing energy consumption in a route tracking system comprises: an input arranged to receive location data associated with a vehicle, e.g. car, lorry, motorbike, watercraft or aircraft, from a location sensor, e.g. mobile device GPS sensor; a processor arranged to generate a first command signal for the location sensor to enter a low power or sleep mode; and an output arranged to output the first command signal to the location sensor. The processor is arranged to: generate a second command signal for the location sensor to exit the low power mode 105; and generate a route query signal for a mapping tool to request a route from a first location associated with the first command signal to a second location associated with the second command signal. A wake up notification signal may be generated when the mobile device connects to a second cell tower or after a predetermined period of time. May determine a most likely route 107, e.g. the shortest route, based on traffic conditions or route preference data. May be used to predict or fill in missing route data when sampling device location at a lower rate to reduce energy drain on device battery.