I am going to be hooking up an 1198si at the dash, a 959hdci sonar, up front, and a terrova ipilot with link on the front. I would like to be able to share waypoints from the 2 head units and also be linked to the trolling motor with both. What is the best possible way to hook these all up. My terrova does have a US2 transducer on it that I plan on hooking up to the 959 for front depth. Will I need a ethernet box and what cables will I need. I will have a separate side imaging transducer on the back of the boat as well. Thanks in advance.