dustforfun, I remember seeing a hand held fishfinder on one of the Saturday fishing shows about 5 years ago or so. I do not remember who made it. Only that the unit was mounted on its oun shaft with a transducer on the bottom. If I remember correctly it even had side look tech. Own built in batteries too. Would be perfect on small row boat with no power on board. They might still make-em, try local marine store, or even on-line mega type store. Good Luck.Break-em all. JEff
I have a Bottom Line Fishing Buddy. It is a graph that looks down as well as to the side and also reads water temp. I use it on my small pond boat and it works great. Easy to use and not very expensive. I bought mine from Bass Pro Shops a few years ago. Uses three C-cell batteries. Check them out at the website above.