I am working on this right now. I could not upload the image but here is the web link.
I made this portable fish finder to be mounted on and Scotty base as soon as I figure out how to make the folding arms for the transducer I will post more pictures. I have it running on a 12v 7 amp hour battery. The unit turns on and runs have not tested it the ocean yet. I will this sat in NPH.
http://img851.imageshack.us/i/imagebdp.jpg/
Papa drew