Flag state oversight is not always enough. Port state control is the inspection of foreign-flagged ships in national ports to verify compliance with international safety, security, and environmental conventions.

Inspectors check certificates, condition, and operational practices. Serious deficiencies can lead to detention until repairs are made. Regional memoranda of understanding coordinate inspection regimes so that substandard ships have fewer places to hide. Targeting systems focus effort on higher-risk vessels.

Port state control acts as a safety net when flag state performance is weak. Ship operators track detention records because they affect reputation, insurance, and charterability. A clean inspection history is a commercial asset.

• Inspection of foreign ships in national ports
• Verifies safety, security, and environmental compliance
• Can result in detention for serious deficiencies
• Coordinated through regional agreements