Your Garmin help, please

On device routing is just about the worst possible option on any garmin cycling device, the more dedicated hiking devices offer better options such as multiple via points rather than just an end point.
With regard to maps, possible reasons for not reading correctly if they are on a micro sd card.

1. Card making poor contact with device, remove card and wipe clean contacts.
   
2. File system on card corrupt, replace card.
   
3. I would suggest that the only active map should be , garmin cycle map eu.