The transducer is the only thing that matters and it will plug in. The HDS units have a built in GPS but if you want to also hook up your external GPS you will need a few misc cables to make it work, but its all plug and play. You will need to install a different power cable but thats pretty simple.
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Jim Maier
BOE Marine
Marine Electronics Sales/Installations, Boat Storage, Boat Transport, Outboard Service
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