I'm leaving the Lowrance family and fixing to switch out to H'bird. I want to buy a 898 c SI combo at the dash and a 798c SI for the bow. Also want to get the xm weather option. E-mailed H'bird about connections but they haven't responded yet and I really want to order everything I need soon. My question is, if I go with the new ethernet setup can I run both units off one GPS antenna, one transducer (SI), and one xm antenna? If so, what cables do I need. Any help would be greatly appreciated.