It wasnt the battery, sadly. Some Fairphone3 have the issue, that their mainboard(?) is breaking down after a couple of years without any clear reason - and I was the lucky one. Its the only “unreplaceble” part and kind of phone breaker. Sure, you can replace this too, but it would somheow be like buying a new phone. At this point, the fairphone 4 was alreasy released, so I took the upgrade. Fairphone 4 and 5 have now a waranty of 5 instead of 2 years. So at least on this point ill be save for 3 years more :>
For car navigation: The in the eOS implemented Version of Magic Maps. Im using it on a daily basis in a professional Context and in my Area (Hamburg, Northern Germany) it works as reliable as googlemaps. (My colleagues are using gm) Traffic-Data is mostly not that accurate. And if you need information about special Adresses like opening hours, ill just look it up otherwise, like on their websites.
For Navigation by bike or for hiking I use the paid German App “komoot”. As a bike Commuter - its the (in my opinion) by far best app for Biking But to be honest, I dont know their privacy rules. And i cant tell if they have a translated version for their app