I'm in the middle of installing new instruments, having chosen Raytheon's ST40 range. A big selling point is they can all talk to each other, using Seatalk or NMEA0183. What is the benefit of this? On a motor vessel, I suppose that you could, in theory, get all the instruments set up so that she could steer herself. But would anybody want to? And on a sailing vessel, with endless wind shifts......? Is it all just good marketing of products , many of whose functions we'll never use? I'm not a technophobe - I actually like new technology so I'd like nothing more than for someone to show me where I've missed the plot - if indeed I have!!