Port State Control

Port State Control is the safety net of international shipping regulation. Primary responsibility for a ship rests with its flag state, but not every flag enforces the rules with equal rigour, so the international community gives the state whose port a ship visits the right to inspect it and to act if it falls short. This means a substandard ship cannot simply hide behind a lax flag: wherever it trades, it can be checked against the same body of IMO and ILO conventions, SOLAS, MARPOL, STCW, the MLC and others.

PSC works through regional agreements known as memoranda of understanding, such as the Paris MoU covering Europe and the North Atlantic and the Tokyo MoU covering the Asia-Pacific region. Member authorities share inspection data and coordinate so that ships are examined across the region rather than repeatedly in one country. A PSC officer boarding a ship checks its certificates and documents, and if there are clear grounds (obvious defects, an unresponsive crew, a poor history) carries out a more detailed inspection of equipment and operations, often asking the crew to demonstrate drills and the working of safety systems.

Where deficiencies are found they are recorded and must be rectified, and serious ones can lead to the ship being detained in port until they are put right, which is costly and damaging to the operator's reputation. Inspection results feed targeting systems that focus attention on higher-risk ships, flags and companies, and repeat offenders can be banned from a region altogether. For the crew, this is why keeping certificates current, maintaining equipment, and being able to actually perform drills matter so much: a well-run ship treats PSC as routine, while a neglected one risks detention.