I have created a private group for live tracking. The other members can see my location and the other location details, but not the last history of my track. I have a location update every 5 seconds and have specified that the last 15 minutes of my track history should be shown. I have seached the manual and the forum, but haven't found this reported as an issue as long as the update interval (in my case 5 seconds) is shorter than the history (in my case 15 minutes). I have a Gold Premium membership.