tomtom@MSI:~$ gpsd /dev/gps0
tomtom@MSI:~$ gpsd -n
gpsd:ERROR: can't run with neither control socket nor devices
tomtom@MSI:~$ cd
tomtom@MSI:~$ gpsd -n -N -D4 /dev/ttyUSB0
gpsd:INFO: launching (Version 3.9)
gpsd:ERROR: can't bind to IPv4 port gpsd, Address already in use
gpsd:ERROR: maybe gpsd is already running!
gpsd:ERROR: can't bind to IPv6 port gpsd, Address already in use
gpsd:ERROR: maybe gpsd is already running!
gpsd:DATA: command sockets creation failed, netlib errors -1, -1
tomtom@MSI:~$ telnet localhost 2947
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
{"class":"VERSION","release":"3.9","rev":"3.9","proto_major":3,"proto_minor":8}