Trace de Trail’ is a public website specialized in mapping trail running routes. A wide range of tools is available to map, personalize, share and look for routes. Some tools have been conceived and developed especially for competition organizers and permanent routes managers. They are presented in the ‘Pro Area’ available in the main menu of the website. ‘Trace de Trail’ cares to bring as much precision as possible in the evaluation of distance and ascending elevation of the routes posted on the website. There has been great attention and optimization to the calculation method since the website creation.