Why can't I enter waypoints in NUNAV Navigation?

Currently it is not possible to create multiple stopovers within NUNAV Navigation.
For this use case we can recommend NUNAV Courier.
NUNAV Courier is a multi-stop route optimiser. It is currently used by courier service providers, supports regional and supra-regional food suppliers in their planning and has also helped to bring many Christmas trees from the sanctuary to the front door.

In the free version, you can make up to 5 stops in the optimal order.
You can download NUNAV Courier from the Playstore under the following link: 
NUNAV Courier

We hope you enjoy trying it out and are happy to answer any further questions you may have.