Welcome to It-Slav.Net blog
Peter Andersson
peter@it-slav.net

I've already got a female to worry about. Her name is the Enterprise.
-- Kirk, "The Corbomite Maneuver", stardate 1514.0

Background

As a computer geek and a sailor I want to have navigation system on-board. The obvious choice is OpenCPN which is an opensource navigation system.
When it comes to hardware it is a little bit more tricky. A balance between money and what you get. I have for several years wanted a Panasonic Thoughbook but they cost alot. It is hard to motivate that price when it will be used just a few weeks during the summer. After browsing ebay I find a used Panasonic Thoughbook CF-19
for a reasonable price, €170 incuding shipping form Germany. I have to live with that the keyboard is not Swedish. When the computer arrived I found that it was equipped with a builtin GPS reciever. That is very handy 😉
This article describes howto get the builtin GPS receiver working with gpsd.

Pre requirements

*Panasonic ThoughBook CF-19 with a builtin Gps receiver
*Operating system with Gpsd installed, I use lubuntu. Lubuntu has modest requirements on the hardware and for such an old box it is good to not have all the bells and whistles.

How to

Bios settings

I tried to use the auto settings in the bios but I never managed to get that running. So I changed the GPS settings to enabled.

Linux

After some googling it looks like the gps receiver is attached as a serial port number 3, in linux that is /dev/ttyS3

peter@Tough:~$ ls -al /dev/ttyS3
crw-rw---- 1 root dialout 4, 67 Mar 10 15:28 /dev/ttyS3

So the group owner of the serialport is dialout.

To get access to the serialport for the gps daemon I modify the /etc/group file
dialout:x:20:gpsd


To get gpds to understand which port the gps is connected to i modified /etc/default/gpsd
# Default settings for the gpsd init script and the hotplug wrapper.

# Start the gpsd daemon automatically at boot time
START_DAEMON="true"

# Use USB hotplugging to add new USB devices automatically to the daemon
USBAUTO="true"

# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES="/dev/ttyS3"

# Other options you want to pass to gpsd
GPSD_OPTIONS=""

Start gpsd

sudo /etc/init.d/gpsd start

Test

To test that you have contact with the gps receiver there is several options, some of them are:

  • xgpsmon
  • gpsmon
  • gpspipe

An example of how gpspipe can look like:
gpspipe -r 127.0.0.1
{"class":"VERSION","release":"3.11","rev":"3.11-3","proto_major":3,"proto_minor":9}
{"class":"DEVICES","devices":[{"class":"DEVICE","path":"/dev/ttyS3","driver":"SiRF","activated":"2016-03-10T15:46:31.952Z","flags":1,"native":1,"bps":4800,"parity":"N","stopbits":1,"cycle":1.00}]}
{"class":"WATCH","enable":true,"json":false,"nmea":true,"raw":0,"scaled":false,"timing":false,"split24":false,"pps":false}
$GPZDA,154633.59,10,03,2016,00,00*6B
$GPGGA,154633,5927.3927,N,01755.3274,E,1,04,2.40,15.16,M,26.139,M,,*78
$GPRMC,154633,A,5927.3927,N,01755.3274,E,0.3836,37.068,100316,,*18
$GPGSA,A,3,24,19,12,01,,,,,,,,,50.0,2.4,50.0*38

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2 Responses to “Using the builtin GPS with Linux and Panasonic Thoughbook CF-19”

  1. Mikael Falkvidd Says:

    Hur exakt är den? https://www.google.com/maps/place/59°27'23.6%22N+17°55'19.6%22E/@59.4564929,17.922272,19z

  2. peter Says:

    Verkar väldigt exakt

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