All right guys here is my question(s). Down Imaging or side scan? I am needing to replace the depth finder at my console, and wondering which to go with. Advantages/Disadvantages? I know there is quite a bit of difference in $$, but is the side scan worth it? I am also wondering if these are hard to install? i currently do not have a built in GPS unit on my boat so I will have to istall antanae and all. All advice and suggestions are really appreciated.