I'm on board with what Jb said. I'm one of those readers who always feels better when the fantasy novel I read has a map. Strangely, I don't care if there is one or not in a scifi novel, even if the action is, say, cross-country on a planetary surface. Maybe because with fantasy it's a straight-up different world, where (if the author has done their job) the cultures aren't immediately recognizable, whereas with scifi, it's really just our-world cultures transported into space?