Thanks for all the info kosmo!!!! It's a big help, I thought buying new toys was supposed to be fun? But to spend 4 grand on these toys and hoping they'll work the way I expect is kind of stressing me out a little. And the lack of knowledge I have on electronics isn't helping.
I'm reading as much as I can about all of this and this forum is by far the best source of info Ive found!
I'll be sure to email humminbird and ask them about the SI and di shutting off when 360 is activated. The 2d was what I was worried about causing interference. I'm pretty sure that the hb tech that I talked to mentioned that.
I also found out that I would have to buy a Y cable and transducer switch to use the 2d sonar on the trolling motor. That would probably eliminate any interference that might be caused by the transom mounted transducer?
Thanks again