I bought this unit 2-3 years ago the question I have is this was one of the earlier units and it did not come with Down Imaging but I was told that I could send it back to H.B.and they could update my unit with D.I.Is this able to be done and is there some where local I could take it to have it updated? I also need to buy a transducer to go on the trolling motor for this unit so does anyone have a used one to sell or know where the best place to buy a new one? Thanks