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Here are the steps for installing gpsd and verifying its performance:
1. Start by making sure you can get data from your GPS, otherwise the later
steps will be very frustrating. In this command
stty -F /dev/ttyXXX ispeed 4800 && cat </dev/ttyXXX
replace ttyXXX with the filename of the port. This will probably be
either /dev/ttyUSB0 or /dev/ttyS0. When you run this command, you
should see text lines beginning with $ come to stdout (possibly after
a short initial burst of binary garbage). If you don't see this, you
may have OS-level problems with your serial support, but more likely
have the wrong device. Look again.
2. If your system supports Linux hotplug and you're using a USB GPS,
go to step 3. Otherwise, make a symlink named /dev/gps to your GPS
port; the command will be
ln -s /dev/ttyXXX /dev/gps
where ttyXXX is as in step 1.
3. Build gpsd from source (skip this step if you have installed a gpsd
binary package).
You will need to have either Motif or LessTif installed in order for
xgps and xgpsspeed to build. If you're on a Linux system, you probably
already have LessTif. Source code is available from
<http://www.lesstif.org/>.
To build from source, run ./autogen.sh (or sh autogen.sh if the
script does not have execute permission). Then run make: libgps.so,
gpsd, xgps, and xgpsspeed will be built. Copy the app-defaults files
xgps.ad and xgpsspeed.ad to your home directory or to the system-wide X
app-defaults directory.
4. Start gpsd. It will not need any options except in the rare case
that you have to specify a driver. If you installed from an RPM, gpsd
will be started for you automatically at boot time.
5. Once gpsd is running, telnet to port 2947. Type 'f' to see what
device it will query. If you need to change the device, use 'f='
to do so (see the manual page for details). Now plug in your GPS.
6. Type "wr" to start raw and watcher modes. You should see NMEA data
(text lines beginning with $) spewing out. You will also see lines
with a GPSD prefix; these are sentence translations in GPSD protocol.
Note that until your GPS has acquired a fix, typing "p" to get position
will only return this:
GPSD,P=?
This response does not mean that gpsd is broken or that the GPS is not
sending data, merely that gpsd has not yet seen any *valid* position data.
You will have to wait for the GPS to acquire satellite lock. If you have
raw or watcher mode on, it should be obvious when you get a lock.
7. Start the xgps client. Calling it with no arguments should do the right
thing. You should see a GUI panel with position/velocity-time information,
and a satellite display. The displays won't look very interesting until
the GPS acquires satellite lock.
8. Check out the list of supported hardware at
http://gpsd.berlios.de/hardware.html
If your GPS isn't on the list, please send us information to add a new
line to the table. Directions are included on that page.
We can also use updates of the latest version number known to work with
hardware already supported.
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