I have no idea, and that's my point. I don't know what's in there. The auto pilot works in "manual" mode -- set the heading, push auto and you're good to go. Turn the dial to adjust. Other than that, I'm clueless -- took me 10 minutes to get the cover off the vhf radio. Just checked. Looks like I am running an old NMEA version as well. The radar had it connected. The GPS didn't have sea talk plugged in, but did use the power/nmea port. The raydata also has a nmea port that was being used in addition to the two sea talk ports.