I have the HDS 5 by Lowrance, and have had a few minor issues dealing with salt build-up. Both the wire connectors and the cradle mounting screws can become difficult to unscrew after a long day of repeated splashing. I would suggest some sort of O-ring on the base of the connecting ports on the head unit. The O-ring would stay at the end of the coupler and below the attaching threads (so these threads stay clean). A rubber washer on the cradle screws (between the screw and the cradle) would still probably hold the unit firm enough, but also allow easier reversing.
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