I came across a used Edge 800 and I wanted something for just turn by turn when downloading and following the GPX files without pulling out the phone. I loaded a few of the GPX files from MTB project of trails I wanted to do and most of them went in as a GPX and made a copy of the file as .FIT (but very small file size). The ones that it made a copy of FIT would show up in the "Course" folder, but the files that didn't add FIT didn't. I don't really know what I did different, I took the SD card out, put the files in the course folder on the card while in the computer, and back into the Garmin. Ideas?