Pardon my ignorance but I don't understand. My friend has the 810 and uses strava so is his garmin sending me and his invitees his ride info or is his smart phone sending it thru a strava app? Is it duplicating? Why have both? I understand that the garmin wont send his ride info without the bluetooth enabled smart phone but what I hear here is the smartphone don't need the garmin, just a strava like app. His info is updated every 60 seconds.