I want to add another Helix to my boat….a Helix 7 at the seat. My Helix 8 is at the bow but connected to my transducer at the back because that transducer is too big to mount on my trolling motor. I was thinking I would link the two units together but wondered if the Helix 7 would work with the XM 9 HW MSI T transducer at the transom? Also since the Helix 8 is at the bow I would switch though the network to the XNT 9 HW MSI 150 T that would come with the Helix 7. Any thoughts appreciated.