In 2009, a group of young people from Kibera, one of Africa's largest slums, found in Nairobi, created the first map of their community. The Map Kibera project worked with 13 local participants to enter data collected using hand-held GPS devices into OpenStreetMap to create a free and open digital map. This map has helped the community to solve and combat various issues: citizens and NGOs have used the data to lobby for resources, negotiate with the police to improve security and better hold government, businesses and anti-poverty projects to account.