Philip's Navigator Britain 2011 shows speed-camera locations, with their speed limits, and provides over 3000 road names as well as numbers. It also includes a massive selection of 100 indexed town-centre maps, detailed approach maps to 12 major urban areas, plus route-planning maps, a distance table, and a fully comprehensive 43,000-name index. The main road maps are at 1.5 miles to 1 inch (Northern Scotland at 3 miles to 1 inch) and are extra clear and detailed, showing even the smallest roads and lanes that are omitted from other atlases. Every roundabout, junction and slip-road is shown in detail on main roads and motorways. In country areas, thousands of individual houses and farms are marked, along with footpaths and tracks. The alpha-numeric grid is based on the National Grid, so that the atlas can be used with GPS systems, and the small-size grid squares make it easier to find locations when using the index.