This document summarizes Crowd2Map's 5 years of experience mapping rural Tanzania to help fight female genital mutilation (FGM). Key lessons include that engaging uneducated rural communities is challenging but rewarding, people appreciate seeing maps of their villages for the first time, and training and building long-term relationships are important. Crowd2Map trained police and activists to use maps to find and protect girls at risk of FGM, and involved remote and local mappers through online tools like Slack. Their goal is to fully map Tanzania with the help of volunteers.