It has become relatively easy to map network, locations, and flows. Two ingredients are very important: 1) a tool that helps you to map your customers, factories, hubs, and so on; and 2) a tool that can geo-code these locations. Luckily both tools are available on-line for free. Demis was founded in 1996 and since then have been working on policy analysis and decision support projects in the field of water, traffic, air and energy. They have produced some terrific products, some of which are available for you to download. For example, Mapper (a GIS application). You can also download a complete set of maps with the world’s countries, roads, cities, etc.. at Demis.