Can the app be used without internet / SIM card? What's the expected data usage?

The Kurviger App can be used without internet or SIM card, but there are some limitations.

View the map:Yes
If you have downloaded the appropriate offline maps.

Navigate/Follow the route:Yes
Kurviger is very resilient when leaving and entering the route again. We also provide helpful tools to get back on route.

Import a route:Depends
The Kurviger app can import .kurviger files without an internet connection and also navigate fully along the planned route. Other route files, such as .gpx, can be imported without an internet connection, but navigation is not possible.

Calculate a route:No
Calculating a route can work without an internet connection is currently not possible.

Search for an address (geocoding):No
Searching for an address requires an internet connection. You can select locations on the map without internet.

This depends on the length route and the area of the route. To give you a rough estimate, with 1MB (note: 1GB are 1024MB), you can calculate more than 100 routes, each 100km long. So the data usage is only minimal, if you have offline maps downloaded.