Ethernet will allow your 2 front units to use 1 xducer ...
You will need the AS ETH 5XPG switch to connect all 3 units ...
https://humminbird.johnsonoutdoors.c...thernet-switch
And you will need the AS EC QDE to connect Ethernet to the head unit ...
https://humminbird.johnsonoutdoors.c...-adapter-cable
Rickie


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