Getting nmea data out of Signal K/OpenCPN

[Island_Moose]

So I tried changing the baud rate with no success. I swapped the 2 wires on the rs485 cable with no success. Data is flowing to the cable as indicated by the Tx LED light on the cable end, but the data isn't being read.

I'm thrilled that I have instruments and GPS position on my chart plotter, but I need to conquer this issue of getting data back out of the Rpi/Openplotter. I'll keep searching.