Download (export) the file to your computer in the .tcx format, then make sure it is named as you want. If not, rename it to the name you want, keeping the .tcx extension. Copy the file to the New Files folder in the Garmin unit. The next time you start the 510, it will take longer than normal to become active. Once active, hold down the enter button, go to Training, Courses, the course you downloaded should be there. Make sure it's highlighted, hit enter, highlight Do Course, enter. To stop the course, Enter, Training, Stop Course.