@Kudee said in No Navigation to Destination if route was left:
On the way I then shortened the route and drove directly towards my destination. What is happening now is very special: MRA is constantly trying to get me back on the original and calculated route!
Sounds perfectly normal. You plan a route, if you deviate you are directed back to the route (which actually is a track, since you uses curvy options). It used to be a lot of people's frustration that, when navigating a track, the system heads to the destination directly when you deviate. Seems to be solved now 
@Kudee said in No Navigation to Destination if route was left:
But you agree with me that this is the simplest thing that any Medion Aldi 79.-Euro sat nav should be able to do
ehm, no! Not for a track.
If you use a direct route, it perfectly does as you propose.