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"how difficult it is to spot a MOB"
The SCUBA industry has given this some thought, since divers often surface away from their boats and then the question is, how to get found and recovered again. One of the gizmos is a vinly plastic "cone" that is designed to be attached to a shoulder strap, blaze orange and inflatable, sometimes with a small light in it which illuminates the whole cone at night. It turns that "head in the water" into a blaze orange pylon 4-6 feet tall.
The downside, of course, is one more thing to buy, carry, and break.