Garmin - The Edge 820 comes with GroupTrack for when you pull away from the pack......or drop off from the pack...... (hopefully not) . Our new feature, GroupTrack1, allows you to pair
Garmin Edge 830 GPS computer review - BikeRadar
Hands-on with Garmin's new Edge 820 with mapping
Reviewed: Garmin Edge 820 - Velo
Garmin Edge 820 Bike GPS (2.3" Touchscreen ,Group Track Keeps Tabs on Fellow Riders ,Advanced Performance Monitoring) | Lazada
Late to group rides? Maybe the new Garmin Edge 820 can help - BikeRadar