I just bought this Garmin Vivoactive 3 five days ago. I adjust the setting from Kilometres to miles. From the last three days doing cycling and walking , It finished in the correct distance. Today I went for an 8 mile run and the watch screen had miles but it was running in Kilometres ?? Known that 8 mile course route, it finished at 12.70 ??? That is kilometres ?? Can anyone clarify this ?? Thanks, much appreciated.