In crisis situations like an earthquake, volcanic eruption, avalanche or epidemic, first responders need up-to-date digital maps to navigate the affected area. However, many remote regions around the world simply do not have the data necessary for aid groups to safely traverse city streets and locate rural villages post-disaster. In the event of a disaster, the Humanitarian OpenStreetMap Team (HOT) mobilizes volunteer mappers around the world to focus their efforts on data deficient regions.