gps.xml

gpsd, a popular GPS daemon.

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   "-//OASIS//DTD DocBook XML V4.1.2//EN"
   "docbook/docbookx.dtd">
<refentry id='gps.1'>
<refmeta>
<refentrytitle>gps</refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo class='date'>9 Aug 2004</refmiscinfo>
</refmeta>
<refnamediv id='name'>
<refname>gps</refname>
<refname>xgps</refname>
<refname>xgpsspeed</refname>
<refname>cgps</refname>
<refname>cgpxlogger</refname>
<refpurpose>test clients for gpsd</refpurpose>
</refnamediv>
<refsynopsisdiv id='synopsis'>

<cmdsynopsis>
  <command>xgps</command>  
      <arg choice='opt'><replaceable>X-options</replaceable></arg>
      <arg choice='opt'>-h </arg>
      <arg choice='opt'>-j </arg>
      <arg choice='opt'>-V </arg>
      <arg choice='opt'>-speedunits <group choice='req'><arg>mph</arg><arg>kph</arg><arg>knots</arg></group></arg>
      <arg choice='opt'>-altunits <group choice='req'><arg>feet</arg><arg>meters</arg></group></arg>
      <arg choice='opt'>-l <group><arg>d</arg><arg>m</arg><arg>s</arg></group></arg>
      <arg choice='opt'>-s <replaceable>smoothing</replaceable></arg>
      <group>
	<replaceable>server</replaceable>
	  <group> 
	    <replaceable>:port</replaceable> 
	      <group><replaceable>:device</replaceable></group>
	  </group>
      </group>
</cmdsynopsis>
<cmdsynopsis>
  <command>xgpsspeed</command> <arg choice='opt'>-rv</arg> 
      <arg choice='opt'><replaceable>X-options</replaceable></arg>
      <arg choice='opt'>-h </arg> 
      <arg choice='opt'>-V </arg> <arg
      choice='opt'>-nc <replaceable>X-color</replaceable></arg> <arg
      choice='opt'>-speedunits <group
      choice='req'><arg>mph</arg><arg>kph</arg><arg>knots</arg></group></arg>
      <group>
	<replaceable>server</replaceable>
	  <group> 
	    <replaceable>:port</replaceable> 
	      <group><replaceable>:device</replaceable></group>
	  </group>
      </group>
</cmdsynopsis>
<cmdsynopsis>
  <command>cgps</command>  
      <arg choice='opt'>-h </arg>
      <arg choice='opt'>-j </arg>
      <arg choice='opt'>-V </arg>
      <arg choice='opt'>-speedunits <group choice='req'><arg>mph</arg><arg>kph</arg><arg>knots</arg></group></arg>
      <arg choice='opt'>-altunits <group choice='req'><arg>feet</arg><arg>meters</arg></group></arg>
      <arg choice='opt'>-l <group><arg>d</arg><arg>m</arg><arg>s</arg></group></arg>
      <group>
	<replaceable>server</replaceable>
	  <group> 
	    <replaceable>:port</replaceable> 
	      <group><replaceable>:device</replaceable></group>
	  </group>
      </group>
</cmdsynopsis>
<cmdsynopsis>
  <command>gpxlogger</command> <arg><replaceable>logfile</replaceable></arg>
</cmdsynopsis>
<cmdsynopsis>
  <command>cgpxlogger</command>  
      <arg choice='opt'>-s <replaceable>gpsd-server</replaceable></arg>
      <arg choice='opt'>-p <replaceable>gpsd-port</replaceable></arg>
      <arg choice='opt'>-i <replaceable>poll-interval</replaceable></arg>
      <arg choice='opt'>-h </arg>
</cmdsynopsis>
</refsynopsisdiv>

<refsect1 id='description'><title>DESCRIPTION</title>

<refsect2><title>xgps</title>

<para><application>xgps</application> is a simple test client for
<application>gpsd</application> with an X interface. It displays
current GPS position/time/velocity information and (for GPSes that
support the feature) the locations of accessible satellites.</para>

<para>In the sky view, satellites are color-coded to indicate quality
of signal; consult the data display to the left for exact figures in
dB. Diamond icons indicate WAAS/EGNOS satellites, circles indicate
ordinary GPS satellites.  Filled icons were used in the last fix, 
outline icons were not.</para>

<para><application>xgps</application> accepts an -h option as for
<application>gpsd</application>, or a -V option to dump the package
version and exit.</para>

<para>An optional argument may specify a server to get data from; a
colon-separated suffix is taken as a port number. If there is a second
colon-separated suffix, that is taken as a device name to be handed
to the daemon in an F= command.</para>

<para>The <option>-speedunits</option> option can be used to set the
speed units for display; follow the keyword with knots for nautical
miles per hour, kph for kilometres per hour, or mph for miles per
hour.  The default is miles per hour.  This option can also be set as
the X resource 'speedunits'.</para>

<para>The <option>-altunits</option> option can be used to set the
altitude units for display; follow the keyword with 'meters' or
'feet'.  The default is feet.  This option can also be set as the X
resource 'altunits'.</para>

<para>The <option>-j</option> option tells the daemon to hold fix data
across cycles, eliminating jitter from NMEA devices that emit several
partial reports.  The downside is that with this switch on the client
will occasionally report stale or invalid data held over from a
previous cycle.  This option is ineffective, and not needed, on
SiRFs and most other non-NMEA GPSes.</para>

<para> The <option>-l</option> option sets the format of latitude and 
longitude reports.  The value 'd' produces decimal degrees and is the
default.  The value 'm' produces degrees and decimal minutes.  The
value 's' produces degrees, minutes, and decimal seconds.</para>

<para>There is a known bug in <application>xgps</application>; it
assumes the default font size is no more than 18 pixels.  If this
is not the case, the satellite data display will show fewer than
12 satellites.</para>

</refsect2>
<refsect2><title>xgpsspeed</title>

<para><application>xgpsspeed</application> is a speedometer that uses
position information from the GPS. It accepts an -h option and
optional argument as for <application>gps</application>, or a -V
option to dump the package version and exit.  Additionally, it accepts
-rv (reverse video) and -nc (needle color) options.</para>

<para>The -speedunits option can be used to set the speed units for
display; follow the keyword with knots for nautical miles per hour,
kph for kilometres per hour, or mph for miles per hour.  The default
is miles per hour.   This option can also be set as the X resource 
'speedunits'.</para>

</refsect2>
<refsect2><title>cgps</title>

<para><application>cgps</application> is a client resembling 
<application>xgps</application>, but without the pictorial 
satellite display and able to run on a serial terminal or
terminal emulator.</para>

<para> The <option>-s</option> option prevents <application>cgps</application>
from printing the raw data. This display can also be toggled with the s
command.</para>

<para>The <option>-j</option> option is as described for xgps above.</para>

<para>Rather than use X resources to determine which units to use, 
<application>cgps</application> looks at variables in its environment.
Here are the variables and values it checks:</para>

<screen>
    GPSD_UNITS one of: 
              imperial   = miles/feet
              nautical   = knots/feet
              metric     = km/meters
    LC_MEASUREMENT
	      en_US      = miles/feet
              C          = miles/feet
              POSIX      = miles/feet
              [other]    = km/meters
    LANG
	      en_US      = miles/feet
              C          = miles/feet
              POSIX      = miles/feet
              [other]    = km/meters
</screen>

<para><application>cgps</application> terminates when you send it a
SIGHUP or SIGINT; given default terminal settings this will happen
when you type Ctl-C at it.  It will also terminate on 'q'</para>

<para>The 'j' command toggles whether or not fix data is cleared at
start of cycle; see the description of the <option>-j</option> of 
xgps (above) and
<citerefentry><refentrytitle>gpsd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
for discussion.</para>

</refsect2>
<refsect2><title>cgpxlogger</title>

<para>This program connects to gpsd, polls for location, and logs
each fix to standard output in GPX (XML) format.</para>

<para>The <option>-s</option> and <option>-p</option> options can be
used to specify a server and port to query.</para>

<para>The <option>-i</option> option sets the poll interval at which
the logger will collect samples.</para>

<para>The <option>-j</option> option is as described for xgps above.</para>

<para>The <option>-h</option> option causes the program to emit a summary of its
options and then exit.</para>

<para>The program also writes start and end messages to syslog.</para>

</refsect2>
<refsect2><title>gpxlogger</title>

<para>This program listens to DBUS broadcasts from gpsd (org.gpsd.fix)
and logs each fix to standard output as they arrive in an XML format.</para>

<para>The output may be composed of multiple tracks. A new track is
created if there's no fix for 5 seconds.</para>

<para>The program also writes start and end messages to syslog.</para>

</refsect2>
</refsect1>
<refsect1 id='see_also'><title>SEE ALSO</title>
<para>
<citerefentry><refentrytitle>gpsd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>libgps</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>libgpsd</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>gpsfake</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>gpsctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>gpscat</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>gpsprof</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para>
</refsect1>

<refsect1 id='maintainer'><title>AUTHORS</title> 

<para>
Remco Treffcorn, Derrick Brashear, Russ Nelson &amp; Eric S. Raymond(xgps). 
Jeff Francis (cgps). Amaury Jacquot <email>[e-mail]</email>
&amp; Petter Reinholdtsen <email>[e-mail]</email> (gpxlogger).
Chris Kuethe <email>[e-mail]</email> (cgpxlogger).
</para>

<para>This manual page by Eric S. Raymond <email>[e-mail]</email>.
There is a project page, with <application>xgps</application>
screenshots, at <ulink url="http://gpsd.berlios.de/">berlios.de</ulink>.</para>

</refsect1>

</refentry>