Currently, NUNAV navigation does not offer the possibility to load map material onto the device and save it there.
We are currently working on a solution so that in future you will be able to load and save a desired map section on your smartphone. Here we are currently in the test phase and ask for your understanding if we cannot yet name a release date in this regard.
Currently NUNAV uses a so-called "environment caching". This means that only the environment data of your last destinations is saved. After the maximum capacity of 50MB is exceeded, the environment data of the "least visited destinations" is released for the environment data of new destinations.
In this way, you only load the map material that you really need and can always navigate with the most up-to-date map at the same time.
However, complete offline use will not be possible, as this would contradict our approach of networked driving. You can find more information about "Collaborative Routing" here.