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My computer is running Ubuntu 16.04 and has a GPS receiver connected to a USB port.
gpsmon shows that the GPS receiver is locked and running.
sudo gpsmon /dev/ttyUSB0 works great!
Why do I have to use sudo to run gpsmon every time?
Is there a way to set the system clock on Ubuntu 16.04 to the time being reported by the GPS receiver without using NTP?
BTW, why do I have to use sudo to run gpsmon every time?
Most likely, your normal user account doesn't have privileges to /dev/ttyUSB0.
From the command line, type:
ls -l /dev/ttyUSB0
And it will return something like:
crw-rw---- 1 root dialout 188, 0 Jan 2 20:46 ttyUSB0
The "root" part is the user that owns the file, the "dialout" is a group associated with the device. You need to add your user account to the group "dialout" then you wont need to start gpsmon with sudo.
This should get you going:
usermod -a -G dialout yourusername
Hope this helps...
pps-tools, or tutorials like gps on raspberry pi 3, or My ADSB Receiver Box – GPS Precision Timesudo adduser username dialout