GPS devices are becoming more common and also more useful as they shrink in size (price?). I used one for much of my rides checking out the course. As you can see from Google maps the course doesn't follow the road accurately at all times. The snap to road feature on Google Maps creates some bizarre routes and of course in many places there are no roads or tracks (Google roads that is). A more accurate track could an interesting and useful tool.
Closer to the event time I hope to have a better GPS track of the course for those interested in carrying a GPS. Of course paper maps are still recommended as their batteries don't fail ;-)