I got ya both beat. In the mid 80's I bought a lawrance green box to use in my little 12' boat at the time. Little did I know ,as time went on the bright idea came to mind that I could use this new piece of tecnology to ice fish. It literally changed my world. I don't use it much any more, but when I get the opportunity to fish a remote lake in Quebec all I need is a few batterys and were good to go. It still works as good as new.
I'm sure someone can go back before the mid 80's lets hear it guys