In maritime practice, flotsam means cargo or ship’s gear lost by shipwreck or
accident that remains afloat and may later be cast ashore. It is one of the traditional common-law categories of “wreck” (with jetsam, lagan and derelict). Modern legislation treats it within the broader concept of wreck: in the UK, see Merchant Shipping Act 1995 (which includes flotsam within “wreck”); in Ireland, see the Merchant Shipping (Salvage and Wreck) Act 1993.
Key legal features:
- Ownership: title generally remains with the original owner unless lawfully transferred; a finder acquires no title by possession.
- Reporting: anyone who finds or takes possession of flotsam in UK or Irish waters, or brings it ashore, must promptly notify and deliver it to the Receiver of Wreck (UK) or the Irish Receiver of Wreck (Irish Coast Guard). Failure to report, concealment or unauthorised disposal can be an offence.
- Salvage: a finder who preserves or delivers flotsam may claim a salvage reward, assessed by the Receiver or the court.
- Unclaimed wreck: if not reclaimed within statutory processes, it vests in the Crown in the UK (administered via the Receiver of Wreck) or the State in Ireland.
Usage and consequences are broadly consistent across England...