Unfortunately I had no success. I made a little file with only 3 lines an named it test.txt:
<br>
<br>$GPGGA,171346.502,5130.6529,N,00710.0091,E,1,06,1.3,109.6,M,47.5,M,16.1,0000*48
<br>$GPGGA,171347.502,5130.6529,N,00710.0090,E,1,06,1.3,109.2,M,47.5,M,17.1,0000*4D
<br>$GPGGA,171348.502,5130.6530,N,00710.0086,E,1,06,1.3,109.0,M,47.5,M,18.1,0000*40
<br>
<br>gpsbabel -t -i nmea -f test.txt -o gpx -F test-t.gpx or 
<br>gpsbabel -w -i nmea -f test.txt -o gpx -F test-w.gpx
<br>
<br>
<br>produces the empty file below:
<br>
<br><?xml version="1.0" encoding="UTF-8"?>
<br><gpx
<br> version="1.0"
<br>creator="GPSBabel - <a href="http://www.gpsbabel.org" target="_top" rel="nofollow">http://www.gpsbabel.org</a>"
<br>xmlns:xsi="<a href="http://www.w3.org/2001/XMLSchema-instance" target="_top" rel="nofollow">http://www.w3.org/2001/XMLSchema-instance</a>"
<br>xmlns="<a href="http://www.topografix.com/GPX/1/0" target="_top" rel="nofollow">http://www.topografix.com/GPX/1/0</a>"
<br>xsi:schemaLocation="<a href="http://www.topografix.com/GPX/1/0" target="_top" rel="nofollow">http://www.topografix.com/GPX/1/0</a> <a href="http://www.topografix.com/GPX/1/0/gpx.xsd" target="_top" rel="nofollow">http://www.topografix.com/GPX/1/0/gpx.xsd</a>">
<br><time>2006-01-16T16:17:17Z</time>
<br></gpx>
<br>
<br>Where is going wrong?
<br><hr align="left" width="300">
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