42.2km. The organizers claim that this is not true and that "the distance is 100 per cent correct" The course was proven to be measured correctly and km points designated accurate. It is known that when using a GPS, the signal can be inaccurate, especially around tall structures like those found in the downtown core, and that it caused an inaccurate reading for some runners using this technology. The course is certified by AIMS and Athletics Canada meeting their measurement criteria and is re-surveyed every 5 to 10 years as required by these respective organizations. List of Marathon winners See also List of marathon races in North America References External links Official website Marathons in Canada Sports competitions in Toronto Recurring sporting events established in 1995 Annual sporting events in Canada Spring (season) events in Canada