pot luck..
As with a few of the other guys who have posted, I also wrote (and highlighted) distances on the ERC High's. Yep, DME Arcs will do the trick as well as other waypoints that appear to be the same distance from the airport. Failing all that, just use the scale! If you do Nathan's course and sit the exam at Maroochydoore, the people there usually don't check your materials at all. Good luck mate!