M:C has a "tech tree", just click the Research Adviser button? Is that what you are referring too? I have pushed the latest changes to git. Routes can be Land, Sea, or Both. I have also added code to the Trade Screens to auto fill in the quick link buttons. At the moment the button graphics are the Trade Route command buttons instead of the Trade Screen buttons because the command buttons are the only ones saved in the EuropeInfos.xml. I'll have to add in the other, better looking, buttons at a later date.