I'm the maker of openfietsmap routable cycling maps, which can be downloaded on openfietsmap.nl and garmin.openstreetmap.nl
As I understood it correctly those maps are produced work. Maps as an cartographic expression can be considered as intellectual property so I licensed them under cc-by-nc https://creativecommons.org/licenses/by-nc/3.0/ which means that users may not sell those maps without my permission.
Am I right to do so or must I published it only under ODbL?
Garmin maps (.img files). They are vector database files all right but they are not really made "for the extraction of the original data", or are they?
Conclusion: Garmin .img file maps or similar vector files for mobile devices are an interesting case as the internal structure is a vector database. In normal cases they are distributed with the primary intention of providing a visual map to end users, therefore it is a Produced Work. If distributed for other reasons, or if someone then extracted data from it with the intention of using it as a database, then it would become a Derived Work.