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I have a Vivoactive 3. The 'navigate' activity just gives you a compass-style pointer in the direction of one of your pre-saved locations.
I got as far installing a 'Maps4Garmin' app which does display a street map, but haven't actually used it!
Edit: Looks like that gives you a just-about scrollable/zoomable map, but no route/waypoint navigation.
TBH I think you're asking a lot for what is primarily a fitness tracker; GPS (and probably map redraws) burns through the battery very quickly.
Apparently! There is a 'navigate' activity although I haven't figured out how to add locations/routes yet
I mainly got it for fitness tracking but hoping I can also use it for mapping as an alternative to my phone