Organic Maps is one of the few applications nowadays that supports 100% of features without an active Internet connection. Install Organic Maps, download maps, throw away your SIM card, and go for a long trip on a single battery charge without any byte sent to the network.
Sometimes it tells you to drive through a fence, over someone’s yard, and into a lake. If you’re from the TomTom/Garmin era it’ll be nostalgic. Still, I’ve been using it for a long time and it’s been my favorite for a while. Early days were a little rough, and sometimes the routes are still a little weird.
I had that with Google Maps a couple of months ago.