But, consider the failure mode. You wouldn't want to fail one MFD and not be able to use the other because of Ethernet cable routing. I only have two displays and couldn't operate the boat reasonably without at least one. I'd have to break out the Sextant and Chronometer - now we're in real trouble....Are your 86's going to the GMS10 independently or are they daisy chained together? Only one needs to go to the GMS10. Or plug the 7808 into one of the 2nd ports on the 86's. Although that's not optimal unless all display's are turned on at the same time.