Double check what model you have because Lowrance never made a 5600. They have a 5300 5" color screen which can be networked, a 5500 5.5" color screen which could not be networked, and a 6500 7" color screen which could be networked with an adapter cable.
You're best bet would be to network it with your HDS (if possible) and use the HDS antenna. If you need any help with the networking cables let me know and I'll put together a list of what you'll need.
-Lawren
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