On Sat, 03 Oct 2015 13:29:26 -0400, "Sir Gregory Hall, Esq."
wrote:

What is a ring mooring, multiple anchors in a circle? If so, how
many?

Two 48" diameter cast iron manhole cover frames or rings, one on
top of the other sunk into the bottom. Each one weighs about 400
pounds.

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Interesting. Do you chain them up to a mooring buoy?