The 10th U.S. national Mapathon will be held in in the weekend of April 11-12, 2015. Let's get together and make the best map of the world even better!

This Mapathon will be dedicated to 'The Great Outdoors'! If you feel like it, get out there and survey trails and trailheads. Richard Weait has written a great blog post about adding trails to OSM to get you started!

Locations

What do I need to know to host an event?