All HDS combo units are the same. You can connect any Lowrance compatible ducer to any HDS unit and the HDS unit will adapt to the ducer. Here is a breif description I wrote on the subject - http://www.boemarine.com/Support/Art...1-adafce154b8b
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Jim Maier
BOE Marine
Marine Electronics Sales/Installations, Boat Storage, Boat Transport, Outboard Service
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