I am glad I found this programm. It looks very promising and I can't wait to give it a try while sailing.
Regarding the option of sending performance data to raymarine instruments I wonder if that might be possible on our boat as well. What are the technical restrictions for that. Our Setup is a mixture between old seatalk, seatalk ng and nmea0183. I would feed qtvlm with nmea0183. I would be able to send nmea0183 through the miniplex multiplexer to seatalk and we have a raymarine seatalk - seatalk ng adapter. As a display we have a i70 available.