<para>
  This format reads and writes GPS information embedded in
   <ulink url="http://www.exif.org">EXIF</ulink>,
   the Exchangeable Image Format, data.  EXIF is a standardized method
  of encoding data in pictures such as JPEG, TIFF, and WAV and is frequently
  used by mobile phones with cameras and cameras with built-in GPS.
</para>
<para>
  EXIF is frequently used for Geolocating photographs so their images can be
  correlated with time and location.
</para>

