Ng Topo Conversion To Gpx ? in GPS technology and devices Posted January 22, 2006 · Edited January 22, 2006 by Grasscatcher This is probably a direct question to robertlipe. Since I've worked with the NG Topo software for a number of years, I have numerous "tpo" files. Are you aware of a way to convert "tpo" file data to "gpx"? Expert GPS will handle the "tpg" waypoint file so that is not a problem. It's just since TOPO went to a single file type instead of separate "tpo & tpg" files What I can't do with Topo is export the tracks in a format that I can then import into another program like USAPhotomaps, Expert GPS or MapSource, where I can do area calculations or plot the track on aerial photos The three softwares above will handle the gpx files and do area calculation. Topo software is by far the most user friendly and "logical" but like every other piece of software, it doesn't quite do everything.