You are in the right place. Welcome aboard! I asked a boat dealer I know and he has never heard of it either. Does it have anything else written on it at all? Just a thought but is it possible to get in contact with the previous owner about how to work it. Is it lighting up when switched on? Is there a sender or paddle wheel on the boat to send it data? If so are you sure the sender (transducer) is connected? Are you certain it is getting power from the battery?