EMSWe once-only: what does it mean for ship agents?

Short answer: For ship agents, once-only means you only have to submit the same data around a port call once, via the national single window. You no longer report the same information separately to different authorities.

What once-only means

The once-only principle is the heart of Regulation (EU) 2019/1239 (EMSWe). It means the same data are submitted only once. The reporting formalities around a port call run through a single national single window, the Maritime National Single Window (MNSW), instead of being scattered across separate authorities.

To make this work, EMSWe establishes a harmonised data set. That data set bundles the information belonging to a port call, with the same terms and formats across all Member States. As an agent you therefore know which data are requested and in what form, regardless of the port the ship calls at.

What this changes for the agent

In practice the ship agent handles a large part of the reporting formalities on behalf of the owner or operator. Once-only lowers that administrative burden: data already submitted do not have to be entered again for the same call. The single windows exchange information among themselves via SafeSeaNet.

Anyone still submitting the same data multiple times is not fully using the benefits of EMSWe. It is therefore worth reviewing your own reporting processes for duplicate entry.

Mind the difference with a port community system

A port community system is not the same as the statutory single window. It is a local or commercial port platform, not a statutory single window. It may be operationally convenient, but the reporting duty under EMSWe runs through the MNSW. So check which channel your mandatory reports are actually handled through.

Read the main file: EMSWe — the maritime single window. Or take the Transport & Logistics scan.