There might be a few things going on.
Since other gps applications return data, check the setting of your OpenCPN. It should look like
Attachment:
Selection_007.png [ 89.28 KiB | Viewed 29527 times ]
When you attach a gps, the gpsd talks to it and distributes the data via port 2947 of the localhost (your machine)
The reason when you execute the command, stty -F /dev/ttyUSB0 ispeed 4800 && cat < /dev/ttyUSB0 that you get stty: /dev/ttyUSB0: Device or resource busy is because it is busy, it's talking to the gpsd.
You have two options:
- kill the gpsd and then run the command, or
- telnet localhost 2947 and after it connects, ?WATCH={"enable":true,"json":true} or ?WATCH={"enable":true,"nmea":true} for a manufactured NMEA sentence (just close the terminal when you're done, it's easier than trying to turn it off)
Quote:
moe@fissionchips:~$ 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}
?WATCH={"enable":true,"json":true}
...but I don't know why you would want to do either option (other than it's cool) when there's cgps, xgps, and other applications to see the streaming data.
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}
?WATCH={"enable":true,"json":true}