Just because you’ve lost internet access, doesn’t mean you have to be lost without Google Maps.
You will need internet access to download the Google Map for your city. Once stored in your phone it will come in handy for those times when you don’t have internet access, or the signal is interrupted.
That map is now stored in your phone giving you access to the maps, driving directions and points of interest information.
Google periodically update the maps with new information. You can check when these updates will apply to each of your maps by opening Google Maps, tapping the Menu icon, and selecting “Offline areas.” This will show all your downloaded maps and their expiry date. You might schedule a reminder in your phone’s diary to download a new one on those dates.
The only thing you’ll have to worry about then is that the phone battery is kept charged!