69 ODROID-XU4 USER MANUAL
Chapter 4
USB GPS module
$ lsusb
…
Bus 003 Device 003: ID 1546:01a6 U-Blox AG
…
$ sudo ls -lsa /dev/ttyA*
0 crw-rw---- 1 root dialout 166, 0 Nov 18 05:26 /dev/ttyACM0
Once the relevant TTY port is obtained, you can check to see if
the GPS receiver is working properly with the following command:
$ sudo cat /dev/ttyACM0 | grep GPRMC
$GPRMC,161053.00,A,3719.54074,N,12201.49867,W,0.079,,110415,,,A*65
$GPRMC,161054.00,A,3719.54074,N,12201.49867,W,0.085,,110415,,,A*65
$GPRMC,161055.00,A,3719.54074,N,12201.49867,W,0.024,,110415,,,A*66
…
The RMC - NMEA has its own version of essential GPS pvt (po-
sition, velocity, time) data, which represents the following information:
$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
RMC Recommended Minimum sentence C
123519 Fix taken at 12:35:19 UTC
A Status A=active or V=Void.
4807.038,N Latitude 48 deg 07.038’ N
01131.000,E Longitude 11 deg 31.000’ E
022.4 Speed over the ground in knots
084.4 Track angle in degrees True
230394 Date - 23rd of March 1994
003.1,W Magnetic Variation
*6A The checksum data, always begins with *
To test the higher level functionality of the GPS dongle, we can use
the services of gpsd, a service daemon, that monitors one or more GPS
modules and makes the pcv (position, course, velocity) data available via
the TCP port 2947 of the host system.
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