THETIS is the new information system that supports the new Port State Control inspection regime (NIR). This information system is crucial for the implementation of the new regime, which is laid down in the new Directive 2009/16/EC on Port State Control. The system serves both the EU Community and the wider region of the Paris Memorandum of Understanding on PSC (Paris MOU) which includes Canada, Croatia, Iceland, Norway and the Russian Federation.

The working name for the system is THETIS - and, fittingly, was a goddess of the sea.

To facilitate planning of inspections, the new system is linked to the Community's SafeSeaNet (SSN) system. SSN provide information on ships in, or expected at, all ports of the Member States. THETIS indicates which ships have priority for inspection and allow the results of inspections to be recorded. Via THETIS these reports are made available to all port State control authorities in the Community and the Paris MOU.

THETIS also interface with a number of other maritime safety-related databases including those of the EU-recognised classification societies, Community and national information systems and other port State control regimes so as to exchange data and provide a full picture for the inspector. Inspection results are also available through a public website.

The Agency had the responsibility for the project management, financing and the development of the system. The development began in November 2008, in close cooperation with Member States and the European Commission and the system, together with the SSN-THETIS interface, was ready for use end November 2010. The system was fully operational, ready for the implementation of the new inspection regime on 1 January 2011. Comprehensive training for Paris MOU users had been delivered in advance.