The CSV has the order of acceleration sensors AFTER the columns for GPS data even though the header says before. Simple test: go into a room with no radio visibility to GPS (all GPS readings will show 0.0 as coordinate in the CSV log) and start a new log. You'll see the zeros in the log before the acceleration data.
Great app, needs fixing Worked well previously. Crashes on Nougat on Nexus 5x.
This app is so criptic and there is no information about the sensors such as units