Is navigation working off-line now? Last time I checked, it didn't. And Google Maps, even on-line, are quite bad at being a map, with the completely unreliable way of rendering street labels. I've used Google Maps off-line in a pinch a few times, but it wasn't too pleasant of an experience.

(Call me entitled, but I don't think it's too much to ask of an off-line map to offer point-by-point navigation and searching through the DB of addresses and POIs in the off-line map. When you can't do it, I get the feeling someone doesn't want you to use off-line mode, and is purposefully overcomplicating things.)

But only in the Google Maps app. Nowhere else.

If you have a GIS system, that is able to use Google Maps as the basemap, you still don't have the ability to save it for offline use. The APIs/libraries/license agreement with Google that these GIS systems use won't allow that.

Not that other providers (Bing, Here, etc) are any better. Your only way is to download OSM data/obtain local ortophoto and make your own tiles.