I'm installing and a 16" hds live, 12' elite FS, and active target2. The FS will be on the bow and only transducer hooked to is will be the active target black box through the ethernet port. He would like the ability to get the info(mainly temp, mapping, and level) from his new transom hd transducer that came with the 16' live unit. Could I just run a network cable from the FS unit to the live unit or do I still need to add a NMEA backbone?