I didn't even know about that baud rate but I just set my pi with :
stty -F /dev/ttyUSB0 460800 and now I am I receiving data from my GPS/AIS and auto pilot. How many hours did I struggle with this?
So my solution is going to be:
GPS/AIS from my S.H. VHF
OpenCPN to miniplex (Surface pro via wifi to my Raspberry pi.)
Raspberry Pi to/from miniplex/auto pilot.
Raspberry pi also running kplex to route
NMEA/Seatalk to surface pro and Android phone
So barunal. I agree. Shipmodul miniplex is a good way to go.