Unless you are in the Top 10 of the race, you will have the company of a LOT of people to make sure you stay on course. :)
In response to:
thanks for the tip to re-read the course description. In his "final 13" section he mentions a confusing spot and to "ignore the sign". Hopefully if it really is that confusing they will have a volunteer at that spot to make sure you dont go off course. Is that true?