“when you said share sonar, does that mean you can use the transom transducer at the bow and visa versa to see sonar and imaging, as long as both units are SI ?”
Yep, with two Si units you can share all of the sonar from one unit to the second one (the first one has to be on for this to work). You can decide to show the Si sonar from the transom transducer up on your bow unit or maybe the Di sonar from your bow mounted transducer on the console mounted unit.
“Does the network capabilities start at the 798SI ?”
Specifically the 798ci HD Si model. The “HD” denotes that this is a 2012 model 798 unit (we have made several versions of 798 units) and so it has an Ethernet connection. Older (non-HD) 798 model units do not have the Ethernet connections on them.
“Have you heard of any success with SI on the trolling motor, I heard you need a speed of 3-5 MPH to work properly.”
Yes I have but more-so on bass fishing type web sites. To get the picture like images that many post on the Internet you do have to have the boat moving at a constant slow speed in a straight direction. However, by slowly turning the trolling motor or while slowly trolling you can also see what is to the sides of the Si transducer. You can try searching this web site for other posts about this.