Crave TV: London black cab races sat-nav

Ever wondered how well a cutting-edge sat-nav would perform against a seasoned black cab driver with the Knowledge? We challenged experienced cabbie Steve McNamara to a race along the winding streets of London town to find out.

All Steve had to guide him was the Knowledge and years of experience -- in contrast all we had was one of TomTom's latest offerings, the TomTom Go 520. Would Steve's grey matter prevail or would the 520 steer us to victory? Click on the video to find out. -Andrew Lim