Now what constitutes a suitable aeronautical chart?
That is a typical example where a law/provision is unspecific because being specific is difficult/impossible/limiting. In this case one has to apply common sense of what is suitable (and it's basically in your discretion). If there is doubt, a court would have to do the hard work of establishing what is suitable.
Germany has had that "suitable" definition for maps for many years and to my knowledge there has never been the need for a higher level court to establish what is suitable.