You may try to remove ECAPB. My Raytheon gear
does not like this sentence.
Otherwise, your configuration looks fine.
Failing that, I suggest that you may need to find a way to use another computer with serial
port to monitor
the output from your system exactly at the autopilot connector. Prove that the configured sentences are actually arriving at the autopilot.
autopilots are known to work with OpenCPN
Do you have any other navigation
program which could be used to test the connection?