In Marisa and co's case, wouldn't it just be easier to call it where you are, then? It's confusing to read it and not be sure where you are.

Like, if you were in the Mushroom Kingdom, for example, you should just say you're in the Mushroom Kingdom. If you list a string of numbers, you'd have to either answer the question when somebody asks, or create a page of info that shows which numbers are designated to which worlds.