I guess someone posted work to convert CDF files to gpx on upwork.
I did not get the work but I have already got the script working which can be found at

https://github.com/kannaiah/cdf2gpx/blob/master/cdf2gpx.py

Instructions assuming you have python installed

pip install gpxpy
pip install ...

I guess someone posted work to convert CDF files to gpx on upwork.
I did not get the work but I have already got the script working which can be found at

https://github.com/kannaiah/cdf2gpx/blob/master/cdf2gpx.py

Instructions assuming you have python installed

pip install gpxpy
pip install ...