For the past 12 months I have been using a Snooper Syrius sat. nav system and I cannot sing it's praises enough. The voice instructions are clear and precise and it's additional speed camera info. is invaluable. I've travelled all over Britain, including some busy cities with complicated one way systems and to date have not once got lost. You pay for what you get as it may be a little more expensive than some sat nav systems but "It does what is says on the tin".