How close do the 2d ducer & the SI ducer need to be to each other? Due to boat configuration and trailer bunks, I'm thinking about putting the 2d ducer on one side of the boat & the SI ducer on the other side. Will this cause any problems? I am puttting a HDS-10 on a stratos 278 bass boat if it makes any difference. Thanks for helping those of us that are new to SI.