Humminbird Fishin Buddy fish finders are the ultimate in portability.  Use it on your boat, your buddy's boat, or the dock. The Fishin Buddy's down and side-looking single beam sonars have no rigging, wiring, or transducers to mount.  Just stick the telescopic pole in the water and turn it on to find the fish.  See up to 240 ft down and 120 ft to the side.