Tom: I think you may be misled in thinking that IGCDroid works everywhere. Whenever the program can't link up with a cell tower, the program ques the data on your phone instead. When it makes the next cell connection it transmits that missing data. The result is that you do end up with a full trace as long as you do eventually land someplace that has coverage; although the data won't always be real time. If you land somewhere remote that doesn't have coverage, you'll be out of luck -- nobody will know where you are from IGCDroid alone. That's when having your satellite transmitter is golden.