<para>This is one of the most capable and expressive formats of all the file
formats supported by GPSBabel.  It is described at <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.topografix.com/gpx.asp">topografix.com</link> and is
supported by EasyGPS, ExpertGPS, and many other programs described at
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.topografix.com/gpx_resources.asp">topografix.com</link>
</para>
<para>
GPSBabel's reader of this module attempts to preserve tags it doesn't
really understand.   It also tries to glean interesting data from:
<itemizedlist>
  <listitem><para><link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.geocaching.com">pocket queries from Geocaching.com,</link></para></listitem>
  <listitem><para>Garmin's "gpxx" GPX extensions,</para></listitem>
  <listitem><para>Humminbird's "h" GPX extensions.</para></listitem>
</itemizedlist>
</para>
