I just bought all new electronics and a trolling motor from a guy and need some help. I have a 999ci hd si at the helm and an 859ci hd on the front with an I-pilot link trolling motor. What I need help with is what I need to link them all together. The trolling motor is hooked to the Ethernet connection on the 859 so what is needed to get the 2 units hooked together? Can I use a Y connection or do I have to have a hub?