Google maps doesn't work offline. I know you can download and save maps. I downloaded sections two months ago. They where about 11 to 13 MB each. When I needed it, I pulled out my phone. GPS worked and it took me to my location on Google Map. But there was one problem. Only the major roads had names. All the small roads were missing names. To get that part of the map you need to connect to wi-fi or a cellular network - which wasn't an option. Caching a section of a map should mean just that - the map and all the important stuff, like road names, get cached. Perhaps at this point all the smart people have moved on an left Google leaving only the marketing and business people. Google's absolute insistence that you should not be allowed to do anything without being connected is infuriating. I assume Google can't stand the fact that there might be 10 minutes when they are not actively tracking one of their users.
To make things worse, when you have no signal and you need maps, you will find Google has deleted all your cached maps older than 30 days, so you are shit out of luck. Will someone inform Google that in most parts of the country it takes 3 years to build or change a road. Not 30 days. An old map is better than nothing. Actually, 99.99% of the time it is just fine.
I previously used Nokia Maps. I only use the map. No directions or other crap. As a simple map, it was an excellent product. I don't need or want anything else other than a map with correct, up to date roads and road names. I somehow passed the 3rd grade, so I have the intelligence to figure out directions on my own.