While trolling from beacon cove to the st. clair light lighouse my buddy noticed something in the water it was a white pole similar to a sail boat mast. I don't believe it's a bouy, no light or markings except maybe the letter K in black. I did not come to close but marked a waypoint on the gps N 42 29.374' W 082 47.646 that should be within a hundred feet you can't miss it. It took me be surprise was wondering if any else noticed it. It looked like a pole, white maybe about 6" in diameter sticking up 4 or 5 feet. It did not show up on gps, at least I think it did'nt I was looking at it & not the screen, then I marked it. It was west of light house from the shipping channel. Curious.