I’m not quite understanding what you are trying to achieve or why you need that extra data. All I am doing is using RTKLIB to end up at a GPX file (from the events POS) and using that file in Geosetter to update the GPS information. These are the file types Geosetter accepts as track files. I don’t know if the CSV they use is a standard CSV or if it has some special “Columbus” header… I assume you can get your CSV into Google Earth. We can also learn to do it through QGIS.