Getting nmea data out of Signal K/OpenCPN

[Techstyle]

how is the VHF connected to the system? if you connect it to the Yakmux it will get the GPS signals directly from the GPS?

Ive connected the vhf to the Rpi with a RS485 serial usb cable.  I was concerned about sending ALL nmea data to the vhf if I connected it directly to the Yakmux, and I wasn't sure the Yakmux shared data coming in on one port to a device on another port.  I also wasn't sure joining the leads at the Yak would work (ie. physically connecting the leads at the Yak)

I think that is the whole point of the mux - to multiplex all the signals to all the ports.

Do you see the GGA sentence coming in from the GPS device?

You should be able to add a TCP network connection in OpenCPN:
Protocol: TCP
Address: localhost
DataPort: 10110
check receive only
and then once added you will be able to pull up the NMEA debug window and see what sentences are available

I would use this instead of the SignalK connection you have (then you can use it to debug)

on the outgoing side, if you transmit only RMB, APB, XTE then you wont get loops
Protocol: UDP
Address: localhost
DataPort: 10110
Check Output only
in the Output filtering box "transmit sentences" RMB, APB, XTE

don't ignore any sentences in SignalK (you have RMB and APB ignored)

once you have done this show us the openCPN debug window

I'm getting good GPS sentences in OpenCPN, the plotter is working perfectly.   I just can't find a way to send any data out of CPN (I want to send data to my autopilot and VHF).

there doesn't seem to be any positions in your GGA sentence 

well you were screening out RMB and APB which have Autopilot sentences on them so you may want to not do that.  As for the VHF what do you have selected in the SignalK to NMEA0183 plugin?

read this page:  https://github.com/SignalK/signalk-to-nmea0183