The last weeks I've noticed that the wheather routing is not working that well in poor wind conditions, and I don't know what the problem is. I'm using the Classic polars, which works quite good. However, if you look at the following Picture, you can see that the wheather routing tool predicts the distance extremely bad. If you use the ruler tool, the prediction is as accurate as in the game.
This is the same picture from the game. You can see the same distance and predicted time as the ruler. But the wheather routing is way off. What is the problem?