EMSWe: one maritime window for ship and port reporting
Adopted 2026-06-14 · ≈ 1 min read · 
edited by Dirk Baaijen
Since 15 August 2025 the EMSWe Regulation (EU) 2019/1239 applies: reporting formalities around a port call run via a single national window, with a harmonised data set and the once-only principle. What that means for operators, agents and ports.
A ship calling at a European port must report a series of formalities: arrival and departure, cargo, crew, waste, security. For a long time these reports differed by country and by authority. The EMSWe Regulation (Regulation (EU) 2019/1239) harmonises that — and has applied since 15 August 2025.
What EMSWe does
Each maritime Member State provides a single national single window (MNSW) as the central point for submitting all reporting formalities around a port call. The regulation establishes a harmonised data set covering all obligations for a port call, and standardises the interfaces — including a module for system-to-system submission. The windows exchange information via SafeSeaNet.
The once-only principle
The practical heart of it is once-only: the same data need only be submitted once per port call, instead of repeatedly to different authorities. That lowers the administrative burden for operators, ship agents and ports and speeds up handling.
What it means for you
Two questions determine your position:
- **Are your ship and port reports connected to the national single
window?** Submission outside the MNSW does not fit the harmonised framework.
- Do you submit on a once-only basis? Anyone still reporting multiple
times is leaving EMSWe's efficiency gains on the table.
Want to know which EU regimes besides EMSWe affect your organisation — the Data Act, eFTI, the AI Act, NIS2 — and where your readiness stands? Take the Transport & Logistics scan.
Sources
- https://eur-lex.europa.eu/eli/reg/2019/1239/oj
Regulation (EU) 2019/1239 (EMSWe): harmonised reporting formalities via national single windows; applicable since 15 August 2025. - https://transport.ec.europa.eu/transport-modes/maritime/eu-wide-digital-maritime-system-and-services/european-maritime-single-window-environment_en
European Commission — EMSWe: national single window, harmonised data set and the once-only principle.
Read next
What must I report via the Maritime Single Window?
You report all reporting formalities around a port call via the national single window (MNSW). Thanks to the once-only principle you submit the same data only once. EMSWe has applied since 15 August 2025.
EMSWe or port community system: what is the difference?
EMSWe is the legal European framework for reporting formalities around a port call through a single national single window. A port community system is a local, commercial port platform — not a statutory single window.
EMSWe once-only: what does it mean for ship agents?
For ship agents, once-only means you submit the same data around a port call only once, via the national single window (MNSW). EMSWe has applied since 15 August 2025.