<para>
  This is the XML format that's used by Navicache.com for
  their geocaching data.  There are a number of fields in it that are
  marked "required" but are Navicache-specific, so GPSBabel can not
  write these files, but we can still read them. 
  <ulink url="http://www.navicache.com/cgi-bin/ib312a/ikonboard.cgi?act=ST;f=23;t=334">navicache.com</ulink>
</para>
    
