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You can plug both of them into the same transducer, as long as both units are NMEA 2000 compatible. The trouble with this is that you need to spend quite a bit of money on extra bits and pieces of network cables etc, that it works out to be no cheaper than getting the second trasducer as well. The good thing is only one transducer in the water. There is one other thing that I'm not positive of, and it's that you can only show sonar on one of the units at a time. The other unit can show depth, but not a sonar reading.
I think that all of the Lowrance sonars are now available without transducers, if you want it that way.
I researched the same thing about a month ago, and was able to ask the Lowrance guys at the boat show. There is a place on the Lowrance website where you can buid a network, with two displays, radar, transducers etc. Kind of cool. I apparently can hook up my Furuno radar with my Lowrance network also to give me position on my radar, but I've yet to figure out how to do it.<img src=icon_smile_dissapprove.gif border=0 align=middle>
FishWish