I have the Lowrance so I don't know the Hummingbird details but I know about the technology they offer at their site. A quick glance at their site shows they sell NMEA2K Ethernet accessories. This is an Ethernet switch:
AS ETH 5PS :: Humminbird
What this will do is allow you to plug different Ethernet devices together and match the ones you want together. An Ethernet device could be a head, transducer, motor information link or maybe a GPS antenna. This tells me you can do what you want through this switch.
I don't know if their transducers are Ethernet native or if they need an adapter. There would be extra cables as well. With Ethernet, you would probably only be able to select one transducer at a time, but that sounds like what you want.
You will also have to deal with the side imaging being turned and twisted constantly as the trolling motor turns versus reading the one in the back that will always show the side imaging with the direction of the boat. It probably depends on the lakes you fish as to whether it would be worth the TM mount or not.



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