IMHO I don't network my units together, my old tourney partner networks his together, and if the one ant. goes down, your out of luck, if your "main" unit goes down, again till you get the other setup as "main" your out of luck, just not fun to mess around while out on the water trying to get something to work, I keep them seperate and don't have the problems as it's happened on his boat a few times from wiring problems, interference to units going down. I have 2 lowrance ant's side by side no problems, like mentioned in the other post.