Do the other methods give you turn-by-turn warnings?
Well, that's puzzling. There isn't anything particularly weird about how my fit files are created. Would you mind sharing the course fit files with me, so I can look into this?
Do the other methods give you turn-by-turn warnings?
I should note that the Garmin course creator has switched from putting all the coursepoints (turn markers) at the end of the file to interspersing them with the trackpoints defining the course, and I haven't yet updated my software to do this, and I've had reports from F5 users that this causes odd behaviour when you join a course anywhere but the end, because the watch doesn't give the turn alerts.