Quote Originally Posted by Fish on Line View Post
DSI stands for Didigital - Side Imaging --- They usualy run about a thousand bucks or more -- and are not as simple to learn
That's very inaccurate, DSI stands for Down Scan Imaging and in the 4 series its just over 200 bucks or so.
SI alone means Side Image.

Humminbird is coming out with a new Helix model early this winter, 2D sonar and GPS will be under 300 bucks. I am waiting to see them before I decide on a bow unit.