Millions of people in the world live in slums. They have little or no money, employment opportunities, or access to clean water and electricity. Now geographers are using GPS & GIS technology to help the people who live in slums improve the conditions there. In an article from NPR they explain that, "..maps are also public records that can help slum dwellers negotiate with city authorities." By mapping the overcrowded conditions they are proving to the governments that their place matters.