<para>
  Serial download protocol for the <productname>GlobalSat DG-100</productname>,
  <productname> GlobalSat BT-335</productname>,
  and <productname>GlboalSat BT-338X</productname>GPS data loggers.
</para>
<para>
  While the DG-100 has a button to record waypoints, they seem to be indistinguishable
  from trackpoints. Therefore, all points will be presented as trackpoints,
  regardless of whether they were recorded automatically or manually.
</para>
<para>
  <ulink url="http://www.globalsat.com.tw/eng/product_detail_00000090.htm">GlobalSat DG-100</ulink>
</para>
<example id="dg-100-on-linux">
  <title>Command showing DG-100 download and erase on Linux</title>
  <para><userinput>gpsbabel -t -i dg-100,erase -o gpx /dev/ttyUSB0 outputfile.gpx</userinput></para>
</example>
<example id="dg-100-on-linux-erase_only">
  <title>Command showing DG-100 erase_only option on Linux</title>
  <para><userinput>gpsbabel -t -i dg-100,erase_only /dev/ttyUSB0</userinput></para>
</example>

<para>
  The DG-100 provides a physical USB interface to the host computer, but
  internally it uses a Prolific PL-2303 chip to do this.  So you must have
  drivers installed on your computer to recognize the PL-2303 and provide
  that data as a serial port to software like GPSBabel.   Such software
  comes with the unit for Windows.  Prolific provides software for Mac OS/X,
  but unfortunately their driver has a defect which makes it unstable with
  GPSBabel.
</para>
