Version for fremantle is available now.

Added log file option. When option is set to txt it will create a log file in /$userdir/gpscon.log
When the option is set gpx it will create a gpx file from the log file.
Only values with an altitude gets saved in gpx.

When you interrupt the application with control+c no gpx file will be created instead use x+enter

You will find the sources in fremantle extra repo.