I'm looking at purchasing a RayChart 425 Chartplotter. All of my Raymarine ST60 instruments are interconnected with SeaTalk cables (with 3 conductors). I've looked at the instruction book (online) for the RayChart and it doesn't look like it uses those type connectors. How will I wire it into the current system so that it will drive my autopilot (ST6002 plus). Has anyone done this?Thanks!