Port State Control (PSC)
Port State Control (PSC) is the inspection of foreign-flagged ships in a country's ports by that state's authorities, to verify that the vessel and its operation comply with international conventions — SOLAS, MARPOL, the MLC, STCW, the Load Line Convention and others. It is a safety net that catches sub-standard ships regardless of their flag state.
Inspectors record deficiencies; serious ones can lead to detention until rectified, which is costly and reputationally damaging. PSC is coordinated through regional agreements (the Paris MoU, Tokyo MoU, and others), which target ships and flags for inspection based on risk profiles. A clean PSC record is a mark of a well-run vessel; repeated detentions flag a problem operator.
A single PSC detention can hold a ship in port for days and blacken an operator's record across a whole MoU region, raising the odds of further inspections. Preparing for PSC — closing deficiencies, keeping certificates and drills in order — is a routine but high-stakes part of ship management, because the cost of a detention dwarfs the cost of prevention.
What happens if PSC finds serious deficiencies?
The ship can be detained until the deficiencies are rectified, and the operator's risk profile — and inspection frequency — rises.
How are ships selected for PSC inspection?
By risk profile under regional MoUs, factoring in ship type, age, flag, class and the operator's history.