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Several innovators have come up with interesting developments that use the conventional satnav systems to reduce fuel consumption and pollution by cars. Regional winners in the European Satellite Navigation Competition 2008 Alex Ackerman and Yossef Shiri have developed the intelligent GreenDrive system that combines information on the type of car, its location and the road conditions to advise the driver on the most economical driving style to use: when to accelerate, when to brake and when to keep the speed constant. On average, this can result in a 15–25% fuel saving. Winner in the same competition in 2007, Prof. Gerhard Güttler proposed the Galileo-Ecodrive system. By using data on a road’s geodetic height profile and the same satnav information, Güttler’s system optimises the operation of auxiliary devices such as electricity generators, air conditioning, power steering, the deep freezers used on trucks for perishable goods and the moveable parts of a cement mixer –devices that consume up to 20% of the fuel.