I guess I overdid it a bit last year but I bought a couple of Jim Buoy winter spar buoys. I got one to mark my mooring anchor and one to mark the raft anchor. They are tapered starting at a 6" diameter and 36" long. The taper is there so that when the ice moves, the bouy will just pull through and go under the ice. That's exactly what happened last winter to one of them and it worked as advertised with no damage to it. I did also use it once as a mooring when I had removed the regular mooring ball earlier in the fall. If I remember correctly, it cost around $60.
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