I've been toying with getting a Garmin 820 for a while now for training, gps, and possible touring as well. I also do organized metric and imperial centuries. These organized events usually plot out the course on Ride With GPS. Can I download the Ride With GPS directly to the Garmin 820 so I have turn by turn navigation coming from the Garmin 820? If so, do I need to purchase the Ride With GPS upgrade too?