I don't think its the map itself that their concerned about. But if certain officials are seen traveling regularly between specific locations, it might be enough for foreign spies (using data collected legally or illegally from Apple) to build a dossier that leads to uncovering specific government/business links.
Or maybe I've just read too much Jean Le Carre and Tom Clancy.
ghehe
Anyway, Tom Clancy or not
Yes I know, this is maybe the time to start the Twilight Zone melody, but that claim from the Chinese is quite vague, you can make out everything of it.
