Mike, if you are going to have AIS as well, it would be very nice to have a permanent, decent-sized display in the cockpit (under the dodger somewhere? remember you will not be steering most of the time). I am a bit of a Luddite but it is best to think of a system approach. We have an older Raymarine display and I was able to interface the AIS to that but could not get a radome to work with it since it everything is digital now. Also, the power consumption of the new digital units is much less than the older CRT ones.