<para> 
This option puts all track points from all tracks into a single track 
and sorts them by time stamp.  Points with identical time stamps will be
dropped.
</para>
<example id="ex_track_merge">
<title>Merging tracks with the track filter</title>
<para> 
Suppose you want to merge tracks recorded with two different GPS devices 
at the same time.  To do that, use this command line:
</para>
<para><userinput>gpsbabel -t -i gpx -f john.gpx -i gpx -f doe.gpx -x track,merge,title="COMBINED LOG" -o gpx -F john_doe.gpx</userinput></para>
</example>

