Units selection option: Change units from Miles to Km automatically, based on location

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/units-change-from-miles-to-km-automatically/
———————————————————————————
It would be nice to have a fourth option of "automatic" when changing the units between metric, imperial and British. Automatic would use the GPS position to determine which country the vehicle was currently in and adjust the setting to the default for that country.