Powerboat Weather Routing on PredictWind App

[@meoutwest]

Thanks for the walkthrough. It was funny to see your example since I have been watching that route the last two weeks on PW. One question…is the roll number a straight line, in that, is a five 20% worse than a four or is it like earth quakes where each number is twice as bad as the lower number like a five is twice as bad roll wise than a four?