When I connect my Drivesmart 66 I see a folder named GPX. It contains .gpx files with ten digit filenames (not counting extension), like 1019573630.gpx, and one file named Current.gpx. There is also a /GPX/Archive folder which contains files with 2-digit names not counting the extension, in my case 67.gpx through 78.gpx. Does anyone know the logic in the storage of tracks in these GPX files? Just curious. Also thinking what I might do with these GPX files.