gps(1)
NAME
gps, xgps, xgpsspeed, cgps, lcdgps, gegps - test clients for gpsd
SYNOPSIS
xgps [-D debug-level] [-h] [-V] [-l [[d] | [m] | [s]]]
[-u [[i] | [n] | [m]]] [server [:port [:device]]]
xgpsspeed [-D debug-level] [-h] [-V]
[--speedunits {[mph] | [kph] | [knots]}] [server [:port
[:device]]]
cgps [-D debug-level] [-h] [-V] [-l [[d] | [m] | [s]]] [-m] [-s]
[-u [[i] | [n] | [m]]] [server [:port [:device]]]
lcdgps [-h] [-V] [-l [[d] | [m] | [s]]] [-u [[i] | [n] | [m]]] [server
[:port [:device]]]
gpxlogger [-D debug-level] [-d] [-e export-method] [-f filename] [-l]
[-m minmove] [-h] [-V] [-i track timeout] [server [:port
[:device]]]
gegps [-d directory] [-i]
DESCRIPTION
These are the demonstration clients shipped with gpsd. They have some
common options:
The -h option causes each client to emit a summary of its options and
then exit.
The -V option causes each client to dump the package version and exit.
The -l option, when present, 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.
xgps, cgps, and lcdgps look at variables in the environment to figure
out what units they should default to using for display — imperial,
nautical, or metric. Here are the variables and values they check:
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
These preferences may be overridden by the -u option.
Where present, the -u option can be used to set the system units for
display; follow the keyword with 'i' for 'imperial' for American units
(feet in altitude and error estimates, miles per hour in speeds), 'n'
for 'nautical' (feet in altitude and error estimates, knots in speed)
or 'm' for 'metric' (meters in altitude and error estimates, kilometers
per hour in speeds).
The -D option, when present, sets a debug level; it is primarily for
use by GPSD developers. It enables various progress messages to
standard error.
By default, clients collect data from all compatible devices on
localhost, using the default GPSD port 2947. An optional argument to
any client 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 specific device name to be watched. However,
if the server specification contains square brackets, the part inside
them is taken as an IPv6 address and port/device suffixes are only
parsed after the trailing bracket. Possible cases look like this:
localhost:/dev/ttyS1
Look at the default port of localhost, trying both IPv4 and IPv6
and watching output from serial device 1.
example.com:2317
Look at port 2317 on example.com, trying both IPv4 and IPv6.
71.162.241.5:2317:/dev/ttyS3
Look at port 2317 at the specified IPv4 address, collecting data
from attached serial device 3.
[FEDC:BA98:7654:3210:FEDC:BA98:7654:3210]:2317:/dev/ttyS5
Look at port 2317 at the specified IPv6 address, collecting data
from attached serial device 5.
Not all clients shipped with GPSD are documented here. See also the
separate manual pages for gpspipe(1) and gpsmon(1).
xgps
xgps is a simple test client for gpsd with an X interface. It displays
current GPS position/time/velocity information and (for GPSes that
support the feature) the locations of accessible satellites.
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.
Square icons indicate WAAS/EGNOS satellites, circles indicate ordinary
GPS satellites. Filled icons were used in the last fix, outline icons
were not.
xgpsspeed
xgpsspeed is a speedometer that uses position information from the GPS.
It accepts an -h option and optional argument as for gps, or a -V
option to dump the package version and exit.
The default display mode resembles a car speedometer. With the option
--nautical you get a more elaborate speed and track presentation
modeled after a marine navigation display.
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.
In the nautical mode only, --maxspeed sets the maximum on the
speedometer.
cgps
cgps is a client resembling xgps, but without the pictorial satellite
display and able to run on a serial terminal or terminal emulator.
The -s option prevents cgps from displaying the data coming from the
daemon. This display can also be toggled with the s command.
The -m option will display your magnetic heading (as opposed to your
true heading). This is a calculated value, not a measured value, and is
subject to a potential error of up to two degrees in the areas for
which the calculation is valid (currently Western Europe, Alaska, and
Lower 48 in the USA). The formulas used are those found in the Aviation
Formulary v1.43.
cgps terminates when you send it a SIGHUP or SIGINT; given default
terminal settings this will happen when you type Ctrl-C at it. It will
also terminate on 'q'
lcdgps
A client that passes gpsd data to lcdproc, turning your car computer
into a very expensive and nearly feature-free GPS receiver. Currently
assumes a 4x40 LCD and writes data formatted to fit that size screen.
Also displays 4- or 6-character Maidenhead grid square output.
gpxlogger
This program collects fixes from gpsd and logs them to standard output
in GPX, an XML profile for track logging.
The output may be composed of multiple tracks. A new track is created
if there's no fix for an interval specified by the -i and defaulting to
5 seconds.
The -d option tells gpxlogger to run as a daemon in background. It
requires the -f option, which directs output to a specified logfile.
The -m option sets a minimum move distance in meters (it may include a
fractional decimal part). Motions shorter than this will not be logged.
gpxlogger can use any of the export methods that gpsd supports. For a
list of these methods, use the -l. To force the method, give the -e one
of the colon-terminated method names from the -l table.
If D-Bus support is available on the host, GPSD is configured to use
it, and -e dbus is specified, this program listens to DBUS broadcasts
from gpsd via org.gpsd.fix.
With -e sockets, or if sockets is the method defaulted to, you may give
a server-port-device specification as arguments.
gegps
This program collects fixes from gpsd and feeds them to a running
instance of Google Earth for live location tracking.
The -d argument is the location of the Google Earth installation
directory. If not specified, it defaults to the current directory.
If you have the free (non-subscription) version, start by running with
the -i option to drop a clue in the Google Earth installation
directory, as 'Open_in_Google_Earth_RT_GPS.kml', then open that file in
Places (File > Open...). Run gpsd in the normal way after that.
SEE ALSO
gpsd(8), libgps(3), libgpsd(3), gpsfake(1), gpsctl(1), gpscat(1), gpsprof(1). gpspipe(1). gpsmon(1).
AUTHORS
Remco Treffcorn, Derrick Brashear, Russ Nelson & Eric S. Raymond, Jeff Francis (cgps). Amaury Jacquot <[email protected]> & Petter Reinholdtsen <[email protected]> (gpxlogger). Chris Kuethe <[email protected]> (gpxlogger), Chen Wei <[email protected]> (gegps & xgpsspeed), Robin Wittler <[email protected]> (xgpsspeed). This manual page by Eric S. Raymond <[email protected]>
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