SIEMENS VDO claims to be the first telematics company to offer the Traffic Message Channel (TMC) service on an aftermarket satellite navigation system. TMC provides up-to-the-minute traffic information from ITIS Holding Floating Vehicle Data System, which uses on-board units on the National Express and Eddie Stobart fleets to monitor traffic flow. This can then be used to re-route around problems on ahead by other road users. The unit costs from £149.99.