<para>
   This option can be useful, if you want to convert a big file with a lot of entries.
   By default GPSBabel creates only 'visible' items.
</para>
<para>
   Sample command to write an mmo file with 'in-vsisible' items:
</para>
<para>
   <userinput>
      gpsbabel -i gpx -f in.gpx -o mmo,visible=n -F out.mmo
   </userinput>
</para>

