Roland 15, I am a huge fan of Gehrten. I think the map is one of the best in OMSI and is done to an extremely high standard, certainly the best freeware addon. One thing I think that could be improved upon is the Tours or Shifts the player selects to drive on Gehrten. My jobs is to design and build bus schedules and driver shifts for Sydney Buses and If you like I could help with the Tours to make them more realistic in Gehrten V3...
(I would have used the PM function, but for some reason it was not letting me PM you).