 Once you've got iOS 17 installed on your iPhone, launch maps, tap your picture in the lower right, choose offline maps and download a new map or maps if you go into different areas. And then this way, and you can even set it while you're in there to only do downloads on wifi, to do automatic updates, to optimize storage, all of these things that are gonna save your bacon someday when you are out and about and either are in an area with no coverage or you're out of data or whatever and you've got offline maps, I actually wound up using this last week because I had set it up just to test the feature when I had the beta running and I was so happy that I had done it so you can do it too.