ive had that as well - i assume its a new feature as i see in the optimum course detals there is now a graph - so if someone can describe what that is communicating that woukd also be helpful

Yes, the dashes are to indicate tacking or gybing. I have some other ideas to improve this too.

You can also display the route optimisation results as the standard table or as a meteogram. When I updated the meteogram a couple of months ago, it made sense to have the option to use it for routing too.

I can see two tracks in that picture.