<para>
   Because speed isn't a real member of a normal waypoint, you can put the speed values into
   the waypoint names. "Point@30" will result in a speed value of 30. By default we assume these
   values are in kilometers per hour.
</para>
<para>
   Proximity distance is also supported by <link linkend="fmt_gpx">GPX</link>, <link linkend="fmt_gdb">Garmin GDB</link>, <link linkend="fmt_ozi">OZI Explorer</link>,
    and <link linkend="fmt_unicsv">Universal CSV</link>.
</para>
<para>
  <userinput>
    gpsbabel -i gpx -f "warnings.gpx" -o garmin_gpi,alerts=1 -F "warnings.gpi"
  </userinput>
</para>

