Port state control (PSC)

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Port state control (PSC) is the inspection of foreign-flagged ships by the authorities of the port they visit, checking compliance with international conventions — SOLAS, MARPOL, Load Lines, STCW, and the Maritime Labour Convention. It exists because flag state enforcement is uneven: PSC is the safety net that catches substandard ships wherever they trade.

Port states coordinate through regional Memoranda of Understanding — the Paris MoU (Europe and North Atlantic) and Tokyo MoU (Asia-Pacific) being the most prominent, with the US Coast Guard running its own regime. Ships are targeted for inspection using risk profiles built from age, type, flag performance, class society record, and inspection history.

Inspectors can record deficiencies and, for serious cases, detain a ship until faults are rectified. Detention data feeds the MoUs’ published white, grey, and black lists of flag performance, and repeat offenders can be banned from a region’s ports. For owners, a detention is costly well beyond the delay: it damages vetting records, charter prospects, and insurance standing.