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<meta name="Author" content="Remco Treffkorn">
<meta name="Description" content="gpsd is a utility that can listen to a GPS or Loran Receiver and re-publish the positional data in a simpler format.">
<meta name="Keywords" content="GPS, translator, GIS">
<title>GPSd — Put your GPS on the net!</title>
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<code>gpsd</code> — a GPS service daemon
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Home<br/>
<a href="#news">News</a><br/>
<a href="#downloads">Downloads</a><br/>
<a href="#mailing-lists">Mailing lists</a><br/>
<a href="#documentation">Documentation</a><br/>
<a href="faq.html">FAQ</a><br/>
<a href="xgps-sample.html">Screenshots</a><br/>
<a href="#recipes">Recipes</a><br/>
<a href="#others">Other GPSDs</a><br/>
<a href="hardware.html">Hardware</a><br/>
<a href="history.html">History</a><br/>
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<div id="Content">
<h1>About <code>gpsd</code></h1>
<p><code>gpsd</code> is a service daemon that monitors a GPS attached
to a host computer through a serial or USB port, making its data on
the location/course/velocity of the sensor available to be queried on
TCP port 2947 of the host computer. With <code>gpsd</code>, multiple
GPS client applications (such as navigational and wardriving software)
can share access to a GPS without contention or loss of data. Also,
gpsd responds to queries with a format that is substantially easier to
parse than the NMEA 0183 emitted by most GPSes. The <code>gpsd</code>
distribution includes a linkable C service library and a Python
module that developers of <code>gpsd</code>-aware applications can use
to encapsulate all communication with <code>gpsd</code>.</para>
<p>The goal of the <code>gpsd</code> project is to create a solid
layer of open-source infrastructure for programs running under Linux
and other open-source Unixes that want to be location-sensitive. We
aim for simple, robust interfaces, unfussy operation, and an easy
learning curve for application developers. Applications that
presently use <code>gpsd</code> include <a
href="http://www.pygps.org">pyGPS</a>, <a
href="http://www.kismetwireless.net/">Kismet</a>, <a
href="http://www.gpsdrive.cc/">GPSdrive</a>, <a
href="http://qpegps.sourceforge.net/">gpeGPS</a>, and
<a href="http://roadmap.digitalomaha.net/index.html">roadmap</a>.</p>
<p>Under Linux, gpsd normally runs with zero configration. The RPM
installs hotplug scripts that do the right thing when a USB device
goes active, launching gpsd if needed and telling it <code>gpsd</code>
which device to read data from. Then, <code>gpsd</code> deduces a
baud rate and GPS type by looking at the data stream.</p>
<p>No, we don't support Windows — get a better operating system.
Our main focus is open-source Unixes — Linux, and the *BSD
family. We'll support proprietary Unixes and hybrids like Mac OS X if
it's not too much work (and it usually isn't).</p>
<p>See the <a href='faq.html'>FAQ</a> for information on how to report
bugs.</a>
<h1 id='news'>News</h1>
<p>The most recent release was @VERSION@.
This web page was last updated on @DATE@.
You can browse the project's <a href='CHANGES'>change log</a>
or <a href='TODO'>to-do list</a> here.</p>
<h1 id='downloads'>Downloads</h1>
<p>Look in the <a
href="http://developer.berlios.de/project/showfiles.php?group_id=2116">download</a>
directory for tarballs of all released versions. Access to the
bleeding-edge developer version is supported <a
href="http://developer.berlios.de/svn/?group_id=2116">via
Subversion</a>. The main project page is <a
href='http://developer.berlios.de/projects/gpsd/'>here on berlios.de</a>.</p>
<h1 id='mailing-lists'>Mailing Lists</h1>
<p>There are three project mailing lists:</p>
<ul>
<li><a
href="https://lists.berlios.de/mailman/listinfo/gpsd-announce">gpsd-announce</a>
is for release announcements and project news.</p></li>
<li><a
href="https://lists.berlios.de/mailman/listinfo/gpsd-users">gpsd-users</a>
is for questions and technical support on <code>gpsd</code>, including support
for application builders using <code>gpsd</code> as a component.</p></li>
<li><a
href="https://lists.berlios.de/mailman/listinfo/gpsd-dev">gpsd-dev</a>
is for <code>gpsd</code> developers.</p></li>
<li><a
href="https://lists.berlios.de/mailman/listinfo/gpsd-commit-watch">gpsd-commit-watch</a>
sends automatic broadcast notifications of commits to the <code>gpsd</code>
repository.</p></li>
</ul>
<h1 id='documentation'>Documentation</h1>
<p>The following manual pages describe the code:</p>
<dl>
<dt><a href="gpsd.html">gpsd.1</a></dt>
<dd>The <code>gpsd</code> daemon.</dd>
<dt><a href="xgps.html">xgps.1</a></dt>
<dd>The <code>gpsd</code> test clients.</dd>
<dt><a href="libgps.html">libgps.3</a></dt>
<dd>An interface library that manages communication with the daemon.</dt>
<dt><a href="libgpsmm.html">libgpsmm.3</a></dt>
<dd>C++ class wrapper for the libgps C binding.</dd>
<dt><a href="libgpsd.html">libgpsd.3</a></dt>
<dd>The low-level library used by <code>gpsd</code> to talk to a GPS.</dd>
<dt><a href="gpsprof.html">gpsprof.1</a></dt>
<dd>The <code>gpsprof</code> program for measuring GPS latency.</dd>
<dt><a href="gpsfake.html">gpsfake.1</a></dt>
<dd>The <code>gpsfake</code> test harness simulating a GPS.</dd>
<dt><a href="sirfmon.html">sirfmon.1</a></dt>
<dd>The <code>sirfmon</code> packet monitor for SiRF GPSes.</dd>
</dl>
<p>We have a <a href='hardware.html'>list of compatible GPSses</a>
with some technical information. We also have <a href='NMEA.txt'>a
list of NMEA sentences</a>.</p>
<h1 id='white_papers'>White Papers</h1>
<dl>
<dt><a href="gps-hacking.html">ESR's Guide to Hacking With GPS</a></dt>
<dd>If you are new to GPS technology and don't quite understand what
<code>gpsd</code> is about, you might find this interesting.</dd>
<dt><a href="replacing-nmea.html">Towards A Better GPS Protocol</a></dt>
<dd>An analysis of what's wrong with NMEA 0183, and a simple way to fix
it.</dd>
<dt><a href="performance">Where's the Latency? Performance analysis of GPSes and GPSD</a></dt>
<dd>An analysis of latency in the GPS/GPSD system. Has implications for the
design of <code>gpsd</code> and vendor claims about binary protocols.</dd>
</dl>
<h1 id='recipes'>Recipes and related resources</h1>
<p><code>gpsd</code> also works with <a href="bt.html">bluetooth
GPS</a> receivers.</p>
<p>We supply a Gentoo Linux <a href="gpsd.ebuild">ebuild
script</a>.</p>
<h1 id='others'>Other GPSDs</h1>
<p>There are two Linux-based forks of <code>gpsd</code> in the wild, but
there are plans to unfork at least one of them soon. You can read a brief <a
href="history.html">history</a> of the <code>gpsd</code> project if
you are curious.</p>
<p>There is a project called <a
href='http://www.mgix.com/gps3d/'>gps3d</a> that ships a gpsd with
similar goals to ours, but which appears to be an independent
development. There haven't been any releases since early 2002.</p>
<p>There is a <code>gpsd</code>-like hack hosted under <a
href='http://www2.musatcha.com/musatcha/computers/software/gpsd/'>Microsoft
Windows</a>. It provides gpsd service from data in netstumbler under
win32. This way programs such as <a
href='http://www.wigle.net'>JiGLE</a> can still get gps data from
netstumbler. This program is not genetically related to
<code>gpsd</code>.</p>
<p>There is an interesting alpha-stage proposal called <a
href='http://www.gpster.net/locod.html'>locod</a> that aims to
integrate location information from GPSes and other sources.</p>
<p><a
href='http://users.hol.gr/~dzach/gpsfeed/index.html'>gpsfeed+</a> is a
program that simulates the output of a GPS in motion, and can be used
for testing GPS-aware applications.</p>
<p>We aren't Green Parrot Software Development, nor are we the
Greenville Public School District or the Greater Peoria Sanitary
District, nor do we have anything to do with the General Product
Safety Directive.</p>
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