Lompaseo - botttles and rubber ducks
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Is it practical to plant a couple hundred floating bottles (or rubber ducks) out there and track where they end up in several days just to confirm how far the currents might have moved them until they were recovered? Forget the underwater currents, the stuff that I have seen never got more than a few feet below the surface (no signs of hydraulic loading)
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It would probably have been a good a idea to drop transmitter-equipped markers where wreckage or bodies were found, early on in the search. The aircraft that found the wreckage may well have done so, though I haven't seen any reference thereto. Bodies would have similar buoyancy and would tend to drift reasonably closely; objects like the galley, with much more windage, would be more subject to localised winds.
Obviously, the longer any collection of flotsam floats, the more it's likely to disperse, particularly so where the aircraft went down.