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So I'm thinking about getting the unit listed in the title and was just wondering if I would also need a transducer because the units I currently have are original to the boat which is a 96' model. I'm pretty sure that I need a transducer but I want to check before I have to spend some extra money. Here is a link to the unit off of the Humminbird site http://www.humminbird.com/Products/859ci-HD-DI-Combo/. Thanks all.