I have my head units picked out but have no idea of what else I need to order to hook everything up. My plan is an Helix 12 Chirp/GPS at bow with 360. Then dual Helix 10's at the dash. One will be a Helix 10 SI/GPS and the other a Helix 10 Sonar/GPS. To be able to get this on one order through my rep I need to know what else is needed to link all this together besides what comes with each unit. Such as how many and what lengths of Ethernet cables?? 5 port hub or two 5 port hubs?? Adapters/dongles?? The boat is a Ranger RT188 so 18' 8" in length. I will be running a 2" BBT mount up front across the trolling pedal tray and a dual dash mount from BBT at the console. Any and all help is greatly appreciated.