Nxploring the Historic Centre of Macaoroute guide for PDA provides an introduction and information on the scenic World Heritage sites situated in the Historic Centre of Macao. Descriptions and visuals can be downloaded by PDA for the convenient use of residents and tourists.     Available in traditional Chinese, simplified Chinese, Portuguese and English, content comprises user interface directions, the universal value of the Historic Centre of Macao, route guide, maps, introduction to scenic spots, albums, and opening times of scenic spots and relevant activities. The interfaces of the system are vivid, and its clear instructions make it simple to use. It is also equipped with a Nxploring round the Historic Centre of Macaomode, which enables users to have a clear picture about the location of scenic spots in the territory. In addition, the streets near each scenic spot are mapped out and can be magnified and reduced for easier searching or consulting.