Ok we have a Helix 9 mega, Helix 7 si gps, Minnkota Terrova and running the mega transducer along with a xnt 9 20 T for depth at speed . We have bought what we need to network everything EXCEPT getting the Terrova hooked in to one of the depth finders. So I called Humminbird to find out what we needed to do. The person I talked to told me we needed a 9 MIDB Y cable. I ordered this becasue she she told me we could hook both the 9 20 T and the Terrova into it, hook it to the 7 be able to back feed it through the ethernet port and get it to the 9. Well I get the y today and the sockets are not right to hook both of those up at all. It is clearly labled side/image on one side and dual beam on the other (yes I asked her at the time about if we could hook both up considering it states one is side image she told me yes we could). So now as I am reading it and it says it is good for mega transducers. The only problem I have is there is one socket on the mega cable that is blank in the y cable. So can someone tell me is this 9 M SIDB Y can actually be used on the mega or not??? Sorry would like to load pics but don't have any right now. TIA