I find google maps offline support pretty good. Seems pretty smart with caching, and if I'm going somewhere in the middle of nowhere without a signal I'm usual

I find google maps offline support pretty good. Seems pretty smart with caching, and if I'm going somewhere in the middle of nowhere without a signal I'm usually using the navigation to get there. As soon as you ask for a route it preloads all the maps. I usually plan my routes while on wifi (restaurant, bar, home, or work) to avoid any cellular data charges. Similar for music and podcasts I use for driving.