using GPS with Linux & output only certain data

Question

Hello I am currently using BU-353 S4 USB GPS in my Linux,

the command,

cgps -s

Output various parameters including, Time, Latitutde, Longitute, Speed, Heading etc...

is there any way to output only Longitude and Latitude instead of the complete details ?

I have gone through all the available arguments of cgps command and as far as I can tell, this command only output the complete table.

What about reading the NMEA data directly from serial port and parsing $GPGGA? — yegorich, Dec 16, 2013 at 15:21

yegorich · Accepted Answer · 2013-12-19 11:30:30Z

6

You can use awk to parse $GPGGA directly. See example below:

echo $GPGGA,001038.00,3334.2313457,N,11211.0576940,W,2,04,5.4,354.682,M,-26.574,M,7.0,0138*79 | awk -F"," '{print $3,$5}'

would output:

3334.2313457 11211.0576940

Update

Try something like this:

awk -F"," '/GGA/ {print $3,$5}' /dev/ttyUSB0

This command should read from /dev/ttyUSB0 (substitute with proper one), find lines with GGA and parse them.

answered Dec 16, 2013 at 15:31

yegorich

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This is exactly what i want , but could you please elaborate your line of code ?
– Sufiyan Ghori
Dec 16, 2013 at 15:40
1

@Xufyan -F"," defines a field separator, i.e. ',' in our case. '{print $3,$5}' prints fields 3 and 5 i.e. our Longitude and Latitude. First field is $GPGGA ,second - the time and the third one is Latitude according to NMEA. All you have to is to read from USB serial port and find GPGGA lines. See updated answer.
– yegorich
Dec 16, 2013 at 15:47
1

@Xufyan I've tested it with my GPS receiver and put the final command to my answer. As long as cat /dev/ttyUSB0 is functioning, my script should also work. Learned something new about awk, pipes etc. myself :-)
– yegorich
Dec 16, 2013 at 16:43
1

Done already , actually i didn't convert from binary to NMEA this is why the issue caused, i had to run this command before proceeding. gpsctl -f -n /dev/ttyUSB0
– Sufiyan Ghori
Dec 16, 2013 at 16:47

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