Now available on Android! Have all the Women’s Flat Track Derby Association rules and standard officiating documents at your fingertips! The WFTDA Android Rules app includes the complete text of the Rules of Flat Track Roller Derby, track design, rules publications and Q&As, referee hand signals, officiating Standard Practices and Verbal Cues and the skater Minimum Skills Requirements.- January 1, 2015 edition of the Rules of Flat Track Roller Derby- Add and organize bookmarks for easy reference to documents- High-quality graphics- Powerful search engine allows you to quickly find any term in any document- Test your knowledge of referee hand signals with our hand signal flash cards