ordered by London borough councils. The bus maps were designed for TfL by the cartographic design company T-Kartor group. An isochrone map of the network was made available in 2007. In 2009, British Waterways produced a map of London's waterways in a Tube-style diagrammatic map, depicting the River Thames, the various canals and subterranean rivers in the city. Attempts to create alternative versions to the official Tube map have continued. In June 2011, the British designer Mark Noad unveiled his vision for a more 'geographically accurate' London Underground map. The map is an attempt to see if it is possible to create a geographically accurate representation of the underground system and still retain some of the clarity of Beck's original diagram. It uses similar principles, fixed-line angles (30° and 60°, instead of 45°) and shortens the extremities of the lines to make it more compact. In 2013, Dr Max Roberts, a psychology lecturer at the University of Essex with a particular interest in usability, information design and schematic mapping, issued his own version of the Tube map. His design, based on a series of concentric circles, emphasised the concept of the newly completed orbital loop surrounding Central London with radial lines. A map created to illustrate Tube-related articles on Wikipedia in 2014 was praised for its clarity and for including future developments such as Crossrail. In July 2015, a map of the network displaying walking calorie burn information for each leg was published by Metro newspaper. Cultural references The design has become so widely known that it is now instantly recognisable as representing London. It has been featured on T-shirts, postcards and other memorabilia. In 2006, the design came second in a televised search for the most well-known British design icon. It is widely cited by academics and designers as a 'design classic', and those cultural associations make London Underground not usually permit the design to be used or altered for any other purpose. That has been officially sanctioned only on a few occasions: David Booth's The Tate Gallery by Tube (1986) is one of a series of publicity posters for the Underground. His work showed the lines of the map squeezed out of tubes of paint (with the name of the gallery's nearest station, Pimlico, on a paint-tube) and has since been used on the cover of the pocket map. In Tate Modern hangs The Great Bear by Simon