This document discusses how maps are being used to help prevent and respond to gender based violence in rural Tanzania. Local activists in rural areas were trained to add missing places and villages to online maps using a smartphone app to help locate girls at risk of FGM or in need of safe houses. Digital champions in each village were also selected and trained to map their villages, report gender based violence incidents using an app, and provide ongoing training and support to community members around issues like women's rights. The mapping data and reported incidents are then visualized and used by social workers and police to quickly protect vulnerable girls.