This is an neat twist on Trail O.
Check out the Long Distance page (under "Schedule") on
coc2014.ca for more details.
The basic idea is that as you ride the chairlift to the start you will have an orienteering map of the terrain below your feet. There will be seven circles on the map, each with a corresponding control description. The question is is there a control at that location? Answer "A" for yes, and "Z" for no. Hence the name AZTrail O (coincidence about my initials).
Remo Madella, a mapper and Italian Trail O guy is the brains behind this bonus event at the 2014 Canadian Nationals