Google has added public transport details for London to Google Maps for mobile.

The service, which is available for devices running Apple's iOS, Google's own mobile platform Android and BlackBerry-based gadgets, now features public transport in the Get Directions option. The handset uses GPS to identify the users location. Once a destination has been entered, the map will offer the Tube and bus routes to complete the journey.

Furthermore, those with a Google Android handset using the search engine's Navigation turn-by-turn direction service within Google Maps for Mobile will also be offered alerts as to when they need to get off a bus or tube during their journey.

"Google Maps for mobile uses your current location to determine the best trip to your destination," Thijs van As, Associate Product Manager, Transit Directions, said in a blog.

"We hope that public transport directions in London make getting around town more convenient!"