We read about this in the Soggy Paws Compendium, and it became standard part of our anchoring process while in the Tuamotus. Basically, the bottoms of most anchorages are littered with coral heads of various sizes. So, even if you find a nice sandy patch to drop the anchor on top of, since the anchor chain lays along the bottom it can get wrapped around a piece of coral if the wind shifts a bit or even as you swing about on your anchor. So, in an effort to minimize the chances of this happening, Tim would attach anywhere from 1 to 4 floats along the chain to keep it elevated up off the bottom. The first few times he did it from the water after anchoring, and this could be quite a chore since you had to get the anchor chain and the float close enough to attach, and the anchor chain is heavy and the float is of course buoyant, so it would take some strength and a lot of kicking while breath holding to make this happen. Eventually, he figured out to just attach the floats from the bow as we are paying out the chain when anchoring. Much easier.
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