In maritime law, flotsam , jetsam, lagan , and derelict are terms for various types of property lost or abandoned at sea. The words have specific nautical meanings, with legal consequences in the law of admiralty and marine salvage. A shipwreck is defined as the remains of a ship that has been wrecked, whether it has sunk or is floating on the surface of the water.Cambridge English Dictionary. "Shipwreck definition.": http://dictionary.cambridge.org/us/dictionary/english/shipwreck
There are a number of factors that contribute to the formation of a shipwreck, which can be divided into physical and cultural processes. A site can be affected by physical processes, that is, naturally occurring processes, such as the corrosion caused by salinity and , or the growth of native and foreign marine organisms. It can also be affected by cultural processes, that is, by human interactions, such as adding or removing materials from the site of the wreck. Any archaeological activity, such as excavation, may also be considered invasive and tampering.Matthew E. Keith, Society for Historical Archaeology. "Site formation processes of submerged shipwrecks." University Press of Florida (2016)
In maritime law, different meanings are attributed to the terms, based on jurisdiction as well as context. For example, a distinction is made between goods that wash ashore and those that are for some reason not salvageable and/or lost at sea.
The term "salvage" is used to indicate a salvage operation, as well as the subsequent awarded compensation. It is considered a voluntary service rendered in cases such as danger to the wreck, or the surrounding navigable waters. In terms of compensation, it is seen as being awarded to anyone who voluntarily assisted in the recuperation of the wreck, whether it be saved from upcoming danger, or from loss.
The law of salvage has its origins in the Roman practice of negotiorum gestio, which dictated that one who preserved or improved upon the property of another was owed compensation from the owner, even if the service was not requested by the latter. The law did not apply to maritime regulations, but were the basis for following ordinances, such as the Marine Ordinance of Trani, which stated that a "finder" was to be rewarded, whether the owner claimed the goods or not. The laws have evolved since negotiorum gestio, and today, in the United States, a salvor who voluntarily brings the goods back into port may legally lay claim to them, or deliver them to a marshal, in return for a reward.Norris, Martin J. "The Law of Salvage". Baker, Voorhis (1958)
In maritime law, flotsam pertains to goods that are floating on the surface of the water as the result of a wreck or accident. One who discovers flotsam is allowed to claim it unless someone else establishes their ownership of it. "Flotsam, jetsam, and ligan". Columbia Electronic Encyclopedia, 6th Edition. 2016. Even when the source is known, items may be considered flotsam claimable by the finder. This occurred with up to 110 cargo containers lost by MSC Zoe in heavy seas in January 2019 off the German shore of Borkum; the lost goods found on the Dutch coast were considered flotsam.
Per maritime law, one who discovers these artifacts is not required to return them to their rightful owner except in the case where the latter makes a proper claim.
However, according to the U.S. National Oceanic and Atmospheric Administration "flotsam may be claimed by the original owner, whereas jetsam may be claimed as property of whoever discovers it".National Oceanic and Atmospheric Administration web page What are Flotsam and Jetsam
According to maritime law, a buoy or other floating object constitutes sufficient grounds for laying claim to an artifact. Lagan must be returned to the rightful owner.
In terms of maritime law, derelict is considered property abandoned on navigable waters which has no hope of being recovered, or sine spe recuperandi, and no expectation of it being returned to its owner, or sine animo revertendi.
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