I used my Garmin Course function for the first time this last weekend. This was on a Fenix 5X but it’s available on a lot of the running models.
It worked very well with a couple of caveats. To use the Course and a Training workout at the same time you have to start a Run, hold the menu (middle left on a Fenix) scroll down to Navigation, Course, select your Course, Do Course which will take you back to the Run main screen. Then do the same thing and select Training, My Workouts or Training Calendar (whichever) and then select your workout or day then Do Workout which takes you back to the main Run menu then select Start (upper right).
That’s caveat one. The other one is that you have to have Course and Map data screens installed on your activity. What I found was since the course was 1 lap and we were doing 3 laps after the first lap the Course screen was blank, just black. But I could use the Map datascreen to show the path that we’d just run and voila we could repeat it as often as we wanted.
It helped because for the first time outside a marked/laid out race course this was the first time we’ve ever run the route that we intended to run at Turkey mountain other than the Powerline out and back. On the return loop of the first lap I went left instead of right at a Y and it was obvious within 30 feet we were off course.
I’m not sure when I might want to use it again but it’s nice to know it’s there.