I'm looking for one for my kayak and don't really want to spend a whole lot but I would like to be able to actually see where the fish is. Theres one at the bass pro shop for round $99 but I'm a little worried about how well that one would actually work. Its made by Eagle. I don't want to just go buy one because of the sevear lack of knowledge involving them. I need to be able to see the bottom layout, the depth, and the fish. So feel free to throw me a few Ideas. Like I said before it needs to be portable. Can't be drilling holes in the kayak since its used for more purposes than fishing.