This spring, I bought an 1159ci HD DI, a 959ci HD DI, the 360 transom mount, and the ethernet switch.
From day 1, the 360 has not displayed correctly on the 1159. I sent it back to Humminbird but they were "unable to find any problem" and returned it to me.
Long story short, after countless phone calls to their "customer service", wherein after an eon on hold they graciously allow you to talk to a girl who is not a technician, but only has a computer database to try to help you from (I asked to speak to an actual, real technician, and was told in a stern voice that they DO NOT EVER take phone calls), I still have the same problems.
Do yourself a favor and avoid Humminbird like the plague.