-instead of the file argument gpsdings will process standard input to standard output. When processing standard input you must specify the conversion direction with
USAGE: gpsdings gpxovl [options] [<file(s)> or -] -g,--gpx2ovl Force conversion from GPX to OVL. -o,--ovl2gpx Force conversion from OVL to GPX. -h,--help Print this help and exit -l,--license Display the licenses for this program and included libraries. -t,--todir <dir> Create output files in this directory.GPX 1.1 can be created from a lot of other geo-coordinate formats with GPSBabel. Use the option "gpxver=1.1" in GPSBabelGUI or "-o gpx,gpxver=1.1" for command line gpsbabel.
No datum conversion is performed, therefore all files should be in WGS84. This program is licensed to you under the GNU General Public License version 3.