Roddy,
Sorry for the delay in answering, I was out of town and did not have computer access. I'm going to order the bow Qbeam (XTM 9 QB 90 T) that fits the 788 ci. I found one on the internet for around $65. After reading HB ethernet manual which indicates that I can share tranducers, I do not know why my si transducer which has the 200/83/455 frequencies would not work. Any thoughts?