Blur.se posted this photo. I received some interesting suggestions on what it might be. Not sure I am convinced about any of them.
"fish finder transducer."
"it's Joe Rouse's secret weapon for catching fish."
"something electromagnetic, stuck on with epoxy putty. Since it's above the water line, it wouldn't have anything to to with fish-finding or other underwater soundings. My initial thought was something having to do with keeping the anchor from swinging around..."
"i think is a earthing cable for lightening strikes as the tall aluminium mast are great electical conductors,"