I joined Audax recently and when registering a diy ride need to send a gpx file and have just realised that the ones on Garmin are 'fit' files.
Is there a way of either getting gpx files from the Garmin or converting them?
You are using Garmin Connect right? Where your ride shows in 'Activities' click on the ride. When it shows up, click on the little cog top right, menu appears and you can export the file to your computer as a tcx or gpx file.
You can also upload and export the data from Ridewithgps and Strava if you use those.