When you activate the CaraMaps Premium subscription at €9.99/year, you can use the offline mode. It allows you to access the database and maps of regions and countries in Europe even when you don't have an internet connection.
To do this, you first need to download the maps you are interested in when you are online. In the app, once you are on the CaraMaps map, click on "offline":
On this screen, you can choose the maps you want to download and then use them in the offline mode. Click on "download" to start the downloading of the selected region. A Loading symbol will appear.
When a region is downloaded to your phone, it appears as "up to date" in the list.
That way, when you no longer have access to the Internet, you can switch to offline mode and choose the map you need from those you have downloaded.
Please note that when you use the offline mode, you have of course access to all the areas referenced by CaraMaps in the region you have downloaded, however those not downloaded are neither accessible nor visible on the map.
Moreover, you cannot add or leave a comment on an area since these functions require an internet connection.