The 2240 naturally has a pedestrian mode, with top-down 2D menus. It also supports cityXplorer maps, although none are included as standard. These provide pedestrian routing which takes into account public transport, suggesting the nearest tube stations to your start and finish points, and which lines to take in between, as well as short cuts through parks, but the maps cost £8.99 per city. Note that there was a special offer on at the time of wrting, offering a free cityXplorer map when you register a new Garmin sat-nav device.
You get a selection of supplementary tools as well, which will mostly be useful when travelling abroad. You can upload images and look at them via the Picture Viewer, with a slideshow function available. There's a World Clock capable of showing three timezones simultaneously, a Calculator, and a Unit Converter for Distance, Speed, Area, Currency, Temperature, Volume, and Weight. There's even a 30-day trial of a Language Guide, the information for which comes from the Oxford University Press. This includes a selection of translations of useful phrases for various situations, into Spanish, German, French, Italian and Portuguese. So if you're having trouble making yourself understood, maybe your sat-nav will have better luck.