Late last week saw an update to both Google Maps and Google Maps for Mobile on Android, iOS and BlackBerry. The update cross references information from the Transport for London (TfL) network to provide comprehensive directions within one of the busiest cities in the world. This is made possible by TfL keeping timetable information publicly available in the London Datastore.

Perfect for tourists commuters or even locals just trying to find somewhere new, the update will give you a full set of instructions from your current position (or one of your choosing) to a destination – be that a postal code or a recognised landmark.
The service includes the bus network, Underground and Docklands Light Railway (DLR) routes. Signal is lost in most of the underground currently – plans to bring 3G to the underground have apparently fallen through earlier this year however 120 stations will benefit from WiFi during 2012 – but the instructions can be kept in offline mode so you don’t forget which stop to get off at!
Source: Official Google Blog