nav v started just to show main roads after last update. Tried reset and new update and still the same. Left in to BMW who also tried and still the same. unit was 2 year old. Local dealer changed it for a new nav v.
fast forward 3 months on and I bought another new bike of them. Good customer service will always keep good customers.
Just showing main roads points to a mapping problem rather than the unit. Several people have had problems with recent map updates leaving them with only the basemap. Sometimes, as in my case, most of the mapping was fine but parts of France were missing. A further map update solved the problem. Replacing the unit would also have solved the problem in the same way as buying a new car would solve the problem of the ash tray being full!
John