I loaded about 20 Tracks to my SD Card using BaseCamp v3.2.2. That created the SDcard\Garmin\GPX\userdata.gpx file. (this also applies to Routes)
When I disconnect the Montana and power On, the Tracks show in the Track Manager. I then re-attach the Montana via USB to my Mac and startup BaseCamp, I see the Tracks in the My Garmin Devices - SDcard. While in BaseCamp, I then Delete the Tracks on the SDcard. BaseCamp shows no data on the SDcard.
I disconnect the Montana and power On. I open the Track Manager and all of the Tracks are still there. I plug the Montana back into USB and open BaseCamp. No Track data is showing on the SDcard or the Montana internal storage. Yet, when I open the SDcard in Finder I still see the userdata.gpx file.
I can delete the userdata.gpx file using Finder and they no longer show in the Track Manager on the Montana.
I also loaded 68 Photo's to my Montana from BaseCamp - also on the SDcard. I was able to delete them from the Montana via BaseCamp.
So, I don't know if this is a BaseCamp issue or Montana issue or both? But, I think it's a BaseCamp issue.
Cheers,