3... 1 onix 8NT (plain jane) up front networked to my onix 10ci combo at the console and I have a lowrance elite 5 because it came with the boat at the console as well and I run the depth on that at max size so I can see it from anywhere plus it is good for high speed depth (side imaging ducers are not good for high speed)... on the does anyone love their side imaging... yes I do it is really nice to know "hey I am 20 -30 feet off the mark" it makes it a lot easier to find the fish and you spend less time in search mode... pulling cranks you can adjust if you mark a fish you can turn and by the time you drag the cranks over the mark you are on top of the fish with them... i have debated hooking the front unit up to my trolling motor ducer but i have also debated installing the ducer that came with that unit for high speed... either way i need a Y cable, extention cable, or an adapter to do it