Yeh - I select the course, and it tells me I am near the start of the route, and would it like to start, and I say yes.
Yesterday, after the u-turn incident, it stayed trouble free until the end of the ride. But I don't know whether that's because there were no other options rather than the fact it was working okay!
I think the navigation is excellent, apart from when it's sending me clearly a different way to the course I have mapped.