    
      
<para> This format is the file representation of the NMEA 
(National Marine Electronics Association) 0183
log and waypoint format for GPS devices.  Some hardware and software
that work with NMEA-0183 formatted data include:
</para>
<simplelist columns="3">
<member>
  <ulink url="http://homepages.tig.com.au/~robk/datalogger.html">GPS Data Logger</ulink>
</member>
<member>
  <ulink url="http://www.gpstm.com/eng/features_eng.htm ">GPS TrackMaker</ulink>
</member>
<member>
  <ulink url="http://www.gpsmaster.nl/ ">GPSMaster</ulink>
</member>
<member>
  <ulink url="http://www.silcom.com/~rwhately/index.html">NMEAlog</ulink>
</member>
<member>
  <ulink url="http://www.visualgps.net/VisualGPSce/default.htm">VisualGPS</ulink>
</member>
<member>
  <ulink url="http://www.gpsu.co.uk/">GPS Utility</ulink>
</member>
<member>
  <ulink url="http://www.kolumbus.fi/eino.uikkanen/geoconvgb/index.htm">GeoConv</ulink>
</member>
<member>
  <ulink url="http://www.commlinx.com.au/GPS_recorder.htm">CommLinx GPS recorder</ulink>
</member>
<member>
  <ulink url="http://www.sparkfun.com/">SparkFun GPS Datalogger</ulink>
</member>
<member>
  AMOD 3080 GPS
</member>
<member>
  Wintec WPL-1000 GPS
</member>
</simplelist>  
<para>
This module also supports <link linkend="tracking">realtime tracking</link> 
which allows realtime position reports from a GPS, such as one connected 
serially, over Bluetooth, or a USB module emulating a serial port, to be used
with selected output formats.  Just specify an input file that is the device
name such as COM1: for Windows or a device-dependent name like
/dev/cu.usbserial for Mac or /dev/ttyUSB0 for Linux.  (Note that serial 
device names vary on Mac and Linux.)
</para>
<para>
When used in <link linkend="tracking">realtime tracking</link> mode, if
GPSBabel does not sense incoming NMEA sentences arriving from the port, it
will send Sirf "reset to NMEA" commands to the port at a variety of speeds
in an attempt to communicate with an attached GPS.   This lets devices
like the Microsoft GPS or Pharos GPS that are Sirf chips with an integrated
USB/Serial adapter work with this input format.
</para>
