Humminbird 110 Fishin' Buddy 4-Inch Waterproof Fishfinder
Use it on your boat, your buddy's boat, a dock, or even a float tube .  Fishin' Buddy Fish finders give everyone the ultimate in portability, with an ergonomic clamp mount design you can use nearly anywhere, with absolutely no rigging or wiring, or even a transducer to mount.  You'll love the high resolution monochrome display and the 24" transducer tube housing reaches the water from most small or mid-size fishing boats.