I'd pay for native offline navigation feature too. However, couple of things are needed to make it happen:

- Those features have to be developed by Appello, which costs money (also Nokia might want some extra €€ for such feats)
- Jolla has to have some infrastructure to actually support payments from inside apps/Jolla Store

It might be that those features are already under development, but not on the next release. I do hope they will become available before the summer though...