I'm a bike guy too(own 7), I just also happen to race cars.
NORRA is already different than any other desert race, that's why I'm doing it.
If I'm looking at a road book and odometer, I'm not looking out for guys like you on bikes trying to figure out which way to go.
What happens when someone makes a wrong turn? The go backwards on the race course.
If you want to navigate with a road book, go for it! Dont worry about someone having an advantage by using GPS because you're not treating it as a race anyways.