Hello Christian, thanks for your suggestion:
I think the problem is that there is no rule which makes a cycleway a cycleway in the default style. What about changing highway=cycleway [0x16 road_class=0 road_speed=1 resolution 23] into highway=cycleway { add motorcar=no; add hgv=no; add motorcycle=no } [0x16 road_class=0 road_speed=1 resolution 23]
I have tested your suggestion and it does not make a difference. I think that the device does not accept any of these tags if the destination is located at that specific way. Even with the commercial card the device directs a car into a track in a forest if the destination is in the forest located at that track and cannot be reached via an "official" car road. I think the problem is that the device is searching for a destination located at the cycleway, and not at the original oneway. Grüße Stefan