Here is another suggestion for technical and practical discussion.

Running Pure Maps with disabling suspend mode will keep the screen alway on. Thats okay for car navigation where you can plug your charger into the phone to keep the battery up and running. However it would be a good idea to blank the screen to save juice and just listen to audio prompts from the speaker.

The scenario is e.g. having your bluetooth earplugs fitted and riding on your bike. If you have no phone bracket mounted or find it distracting watching on your display (it's better nowaydays to keep an eye on the vehicles around you than to look on your phone) the phone consumes an unnecessary amount of valuable energy.

The current situation is that if I turn off the screen by closing the magnetic cover or push the on/off button the kernel will suspend any running process so Pure Maps will go into deep sleep updating only position and routing once the phone is woken up from suspend.

Now thats keepalive is official approved by Jolla what about periodic background processing option supplied by Nemo keepalive (https://git.merproject.org/mer-core/nemo-keepalive)? Would this prevent deep sleep if screen has been turned off, but allows Pure Maps to update current position just in time to re-route and play voice prompts?