I want to share a little experience with WAZE today..
I have navigated today twice, both ways is 1h 10 min..
Both navigation's without any problem with GPS positioning. No lost signals or something else...
First way i have started with 67% of battery and finished it with 16% (without charging during navigation) and back cover was hot
The second way I have started with 6%, connected to charger and finished with 5%, obviously the back cover also was hot

Advantage:
work good and stable. No lost signal because of charger (problem of N9), show speed cams, police etc..

Disadvantage:
* Can't use my native language for searching because of Jolla still not support RTL languages (hebrew, arabic..)
* Eat too much battery
* Show not correct ETA on the bottom bar (2 hours back), but if you press on it, you can see in the popup window the correct ETA.
* Loudspeaker volume is too low (not tested yet Volume+ that suggested by hana two posts above).
* Tried to install Talk & Drive (for voice commands) but app said "Voice recognition is not installed on your device..