My biggest complaint about roll chart /road book navigation is when my odo doesn't agree with the roll chart. There have been sections like this every time I have used a roll chart. If i ride a long wheelie, which I occasionally do, then I am off a couple of tenths. I am gonna shut up now, because I don't want my opinion to be interpreted as a criticism in any way. It is not. I am gonna keep up with this thread though.