Okay so I picked up my 820 about a year ago and found that some of the included Open Cycle maps don't list many of my local MTB trails. So, I've used free Open street maps ever since that are more up to date and do indeed include almost all of the trails.
However, My friend just got and Edge 1000 and reported that like the OSM maps, most of the trails ARE visible on the default maps on his edge. He said that he did install a Garmin update and map update via Garmin Express. ...And then I read here that Gamin updates the open cycle maps quarterly so I connected my 820 to my PC yesterday and installed the map update that was waiting.
The map update took about and hour and a half but after the update, the maps seem to be the same as my original maps and most of the trails that have been added to OSM more than 6 months ago are still not displayed on the latest Garmin maps. I'm happy to continue using the free OSM maps but does anyone know why the Garmin Maps are not updated with what is on OSM for over 6 months? Or why a newer Garmin map would include the trail but not the updated maps I installed?