I'm based in the UK and created a course in Garmin Connect, but it tries to send me the wrong way around roundabouts, the wrong way down one way streets and on turnings that I can't take as they're on the wrong side of the road. I found this thread from 2012, and it seems Garmin hasn't bothered to fix this very basic functionality.
https://forums.garmin.com/archive/index.php/t-30936.html
I'd like to use GC for courses as it allows me to send them straight to my 510, I think this is possible from Strava as well but only if you're a premium member.
Any chance of Garmin fixing this? I think it could be considered dangerous and should come with a health warning if they aren't fixing it.