Please sanity check my proposed system

[Steve - Raymarine - Moderator]

Understand the confusion, but stated in my initial response "The i70 can communicate on Seatalk 1 or Seatalk NG but NOT both."

In 3.4, you are adding the i70 into an existing Seatalk 1 system. So, it will work in that context, but you are looking to bridge both Seatalk 1 with the ST40 and the ST4000+ and NMEA 2000 with engine monitoring.

In 3.5 both diagrams are showing connections of the i70 to a Seatalk NG backbone, and a NMEA 2000 backbone, item number 3 in the second diagram is showing the (NMEA 2000) DeviceNet backbone. So either way there needs to be some kind of backbone either Seatalk NG or DeviceNet(NMEA2000).