ROVR draws your explorer tiles on your Edge, with you in the middle. The tiles you've already explored are blue and the ones still waiting are gray. A tile you pick up on this ride turns green as you roll into it. You need a free ROVR account at rovr.cc. It reads your rides from Strava, Ride with GPS or files you upload, so your map is ready before you clip in. To set it up, add ROVR to a data screen. Until it's paired, the field shows a code. Sign in at rovr.cc and type that code in Settings, under Garmin. Your tiles show up a few seconds later. Hold the field and open its settings to pick one of three grid sizes (Microtile, Tile or Macrotile), set how many tiles it shows across, turn the map with your heading, or draw the roads. (The Edge 520 Plus and 820 don't draw roads.) The field gets its tiles through Garmin Connect on your phone or over the Edge's Wi-Fi, and keeps the last map on the Edge in case a ride starts with no connection. Compatible with Strava.