I understand the update procedure, but am still at a loss on how to transfer waypoints to my 788. I have downloaded HB PC and have opened the GPX file containing my waypoints into it and can view them fine. Problem is I am missing how to transfer these files to a SD card from the program and then to the 788. Can you transfer a gpx file from a SD card directly into the 788 like you do an update? If so what is the correct procedure?