I am new to the hummingbird family and the learning curve is steep. I bought my boat with a 798si at the console and a 788di on the bow. They were interlinked together with the 798 using its own transducer and the 788 using the minn kota fortrex built in transducer. Everything worked perfect. I upgraded my units to a 1199hd si at the console and a 999 hd si on the bow. They are Ethernet connected to each other. I had planned to use all 4 units at a time but due to transducer interference I am not able to. Is there a better setup for what I have or is just leaving the 2 older units off the best way. Also my 2 new units are approximately a year old. Should there be any updates on the units and how difficult is it to do?
Thanks