I am looking for a small fishfinder to use on my 12 ft flatbottom jon boat. I haul it in the back of my truck, and use it for waterfowl hunting. I am looking for one more for the depthfinder part of it, as I will going into shallow water in the dark. If anyone has good portable one, or can even tell me a decent lower end one to get, it would be appreciated. Thanks!