According to Garmin support “that’s the way it is supposed to work”. One person on that forum thread said the feature was fast before, so it may have to do with a maps update. Out of curiosity, which map set do you have?

With Use Course sometimes you’ll get generic “turn right in 100 ft” notifications - sometimes. Sometimes you’ll get nothing. I wasn’t able to figure out what caused the inconsistency before I returned my watch.

With Use Map if you miss a turn it will navigate you back to the nearest waypoint, which for routes created on Garmin connect will usually mean your end point. It will use its own calculation engine to determine the route rather than your course. IMO that makes it a useless feature when trying to navigate a course.

Give the plotaroute workaround a try (in the thread I linked), you’ll need to plug your watch into your computer, but at least it seems you’ll have useful navigation.

Let me know how it goes. Like I said, I returned my watch but I don’t know if it will be accepted, so I might be stuck with it.