I think most of this has been said but just to reiterate, from a sailing perspective there is little point having the forecast along the entire route for one moment in time as clearly, for a journey of any length, the situation will have changed substantially by the time the boat (moving at 6-7kts) has got there! So it would be really nice if 'boat mode' by default showed the predictions along the route given a specific boat speed.
That said, I have now got the hang of the fact that the weekdays along the top of the table do not relate to the weather beneath (this was very confusing) and I can make predictions by shifting the bar around. It's a bit cumbersome, but nonetheless worthwhile and helping me guide my friends across the Indian Ocean.
The last request is that the routes be save-able! (if they are already I have not seen how?). It is a pain to have to keep re-entering multiple waypoints everytime I come back to the app!
Thanks for everything, this is the most brilliant weather program in existance!