If your fleet trades globally, you're operating under at least two of the world's most influential PSC regimes simultaneously — and they don't work identically. The Paris MOU (Europe and North Atlantic, 27 members) and the Tokyo MOU (Asia-Pacific, 21 members) both use the New Inspection Regime (NIR) for risk-based targeting, both publish White-Grey-Black flag performance lists, and both conduct joint Concentrated Inspection Campaigns. But they differ in database systems, flag list calculation methodologies, company performance metrics, inspection windows, PSCO training standards, and enforcement intensity. A vessel detained in Rotterdam under Paris MOU standards has that record visible to Tokyo MOU inspectors in Singapore — but the risk profile calculation that flagged the vessel for inspection may have weighted factors differently. For fleet managers and Designated Persons Ashore (DPA), understanding these differences is not academic — it directly affects which vessels get inspected where, how your company performance is rated in each regime, and what specific areas PSCOs in each region prioritise. This guide provides a point-by-point comparison of the two regimes, with practical guidance for fleets trading in both regions. Start a free trial of Marine Inspection to monitor PSC performance across both regimes with unified deficiency tracking and pre-arrival preparation.
Paris MOU
Europe & North Atlantic
27 Member States
Established 1982
VS
Tokyo MOU
Asia-Pacific
21 Member Authorities
Established 1993
Head-to-Head: The Complete Comparison
This table is the reference every fleet manager needs when preparing vessels for cross-regional operations. Book a Marine Inspection demo to see how unified PSC tracking works across both regimes.
Table 1: Paris MOU vs Tokyo MOU — Point-by-Point Comparison
| Feature | Paris MOU | Tokyo MOU |
|---|---|---|
| Coverage | Europe, North Atlantic — 27 member states including EU members, Russia, Canada | Asia-Pacific — 21 member authorities including China, Japan, Korea, Australia, Singapore, plus Panama (associate) |
| NIR Adoption | Pioneered NIR in 2011 — the original risk-based targeting system | Adopted NIR in January 2014 — modelled on Paris MOU approach |
| Database System | THETIS — operated by EMSA (European Maritime Safety Agency). Integrated with EU MRV, FuelEU Maritime, and EU ETS reporting. | APCIS — Asia Pacific Computerized Information System. Hosted by Russian Federation's Information Centre. Publicly searchable by IMO number. |
| Flag List Methodology | Binomial excess factor calculation on rolling 3-year detention ratios. Statistical comparison against expected detention rates. Published annually (valid Jul-Jun). | Similar statistical methodology but calculated independently. Flags need minimum 30 inspections in 3-year period to be listed. Published on rolling basis. |
| Company Performance | Based on ISM DOC holder's fleet performance. Deficiency ratio and detention ratio benchmarked against Paris MOU fleet average. | Deficiency index + detention index compared against Tokyo MOU average. Company ranked: Very Low, Low, Medium, or High performance. Updated daily on 36-month rolling basis. |
| RO Performance | Classification society rated by detention/deficiency ratio. High Performance required for low-risk ship qualification. | Same concept — High Performance + recognised by Tokyo MOU member required. Minimum 60 inspections in 3-year period for listing. |
| Inspection Windows | High Risk: 5-6 months. Standard Risk: 10-12 months. Low Risk: 24-36 months. | High Risk: 5-8 months. Standard Risk: 10-18 months. Low Risk: 24-36 months. Slightly wider windows overall. |
| EU Regulatory Layer | EU PSC Directive 2009/16/EC adds legal enforcement obligation for EU member states. EMSA monitors and benchmarks. Access denial for repeat offenders. | No equivalent supranational legal layer. MOU is a non-binding agreement (though practically enforced by members). |
| Banning Mechanism | Ships can be refused access (banned) from all Paris MOU ports after repeated detentions. Three detention levels: first refusal, second refusal, permanent ban. | No formal banning mechanism. Ships published on under-performing list but not formally banned from ports. |
| 2026 Joint CIC | Cargo Securing — September to November 2026 (Joint Paris + Tokyo MOU campaign) | |
Where They Align — And Where They Don't
Despite sharing the NIR framework, the two regimes operate with different enforcement cultures, institutional structures, and practical priorities. These differences matter when you're routing vessels across both regions.
Where They Align
Both use Ship Risk Profile (SRP) based on ship type, age, flag, RO, company, and history
Both classify flags as White, Grey, or Black based on detention performance
Both share inspection and detention data with each other and other MOUs
Both enforce the same IMO/ILO conventions: SOLAS, MARPOL, STCW, MLC, ISPS, BWM
Both conduct joint Concentrated Inspection Campaigns annually
Both use the same deficiency codes and detention criteria based on IMO Resolution A.1185(33)
Where They Diverge
Paris MOU has EU PSC Directive — legal enforcement obligation, not just MOU agreement
Paris MOU can ban ships permanently — Tokyo MOU publishes under-performing list only
THETIS integrates with EU ETS, FuelEU Maritime — APCIS is standalone PSC system
Paris MOU PSCO training standardised through EMSA — Tokyo MOU training varies by member
Enforcement consistency differs — research shows greater PSCO variation across Tokyo MOU ports
Company performance metrics calculated slightly differently (indices vs ratios)
Unified PSC Performance Across Both Regimes
Track deficiencies, detentions, flag list status, company performance, and CIC preparation across Paris MOU and Tokyo MOU operations in one dashboard — Marine Inspection gives fleet managers complete PSC visibility regardless of trading region.
Flag Performance Lists: Different Numbers, Same Ship
A flag can appear on the White List in one MOU and the Grey List in the other — because each regime calculates performance independently from its own inspection data. This means your flag's risk profile contribution may differ between regions.
Table 2: Flag List System Comparison
| Aspect | Paris MOU | Tokyo MOU |
|---|---|---|
| Calculation Period | 3-year rolling period (calendar years) | 3-year rolling period (updated periodically) |
| Minimum Inspections | Varies by statistical method — smaller flags may be excluded | Minimum 30 inspections in 3-year period required for listing |
| Statistical Method | Binomial excess factor — compares actual vs expected detentions using statistical significance test | Similar statistical approach — detention rate compared against regional average |
| Publication Cycle | Annual — valid 1 July to 30 June following year | Published on Tokyo MOU website, updated periodically |
| IMO Audit Requirement | Not explicitly required for White List but considered in overall assessment | Completion of IMO Member State Audit Scheme (IMSAS) required for flag to qualify as Low Risk |
| Consequence of Black List | Ships flying Black List flags receive higher risk points. After repeated detentions: access denial (ban) from all Paris MOU ports. | Higher risk points in SRP calculation. No formal port access denial mechanism. |
Fleet Manager Action Checklist: Trading in Both Regimes
If your vessels call at ports in both Paris and Tokyo MOU regions, use this checklist to ensure you're prepared for the differences. Sign up for Marine Inspection to automate cross-regime compliance tracking.
Know Your Risk Profile in Each Regime
Check your flag's status on both Paris MOU White-Grey-Black list AND Tokyo MOU list — they may differ
Verify your classification society (RO) meets High Performance criteria in both regimes
Review your company (ISM DOC holder) performance indices in both THETIS and APCIS
Calculate approximate inspection windows for each vessel in each regime
EU-Specific Preparation (Paris MOU)
FuelEU Maritime monitoring and reporting current — first compliance cycle underway 2025-2026
EU ETS — emission allowances surrendered for covered voyages (70% for 2025, 100% from 2026)
Mediterranean SOx ECA compliance (from May 2025) — fuel documentation ready
Check if vessel has any previous Paris MOU access denial history — banning is cumulative
Asia-Pacific Preparation (Tokyo MOU)
APCIS record reviewed — previous deficiencies in Asia-Pacific ports all closed
Port-specific requirements checked (China emission zones, Australia ballast water, Singapore BWMS)
CIC preparation complete (2026: Cargo Securing — Cargo Securing Manual, lashing gear, crew competency)
Pre-arrival ballast water reporting forms prepared for ports that require them
Universal Preparation (Both Regimes)
All statutory certificates valid with endorsements current — SOLAS, MARPOL, STCW, MLC, ISPS, BWM
Record books complete — Oil Record Book, Garbage Record Book, BWRB, hours of rest
Fire safety equipment operational — doors, dampers, detection, extinguishers, crew drill-ready
Previous inspection deficiencies from either regime closed with documented evidence onboard
Frequently Asked Questions
Do Paris MOU and Tokyo MOU share inspection data?
Yes. Detention and deficiency data is shared between the two regimes and with other regional MOUs. A detention in a Paris MOU port is visible to Tokyo MOU PSCOs when your ship arrives in Asia-Pacific — and vice versa. This cross-regime data sharing means detention history follows your vessel globally, affecting your Ship Risk Profile in every region you trade.
Can my flag be on different lists in each MOU?
Yes. Each MOU calculates flag performance independently using its own regional inspection data. A flag with strong performance in European waters (White List in Paris MOU) might have weaker performance in Asia-Pacific (Grey List in Tokyo MOU) or vice versa, depending on which vessels flying that flag trade in each region and their inspection outcomes. Always check your flag's status in both regimes.
What is the biggest practical difference between the two regimes?
The EU regulatory layer. Paris MOU operates within the EU PSC Directive framework, which adds legal enforcement obligations, EMSA oversight, standardised PSCO training, and — critically — the power to ban ships from all EU ports after repeated detentions. Tokyo MOU is a non-binding agreement (though practically enforced by its members) with no equivalent supranational legal framework and no formal port banning mechanism. Additionally, Paris MOU's THETIS database integrates with EU ETS and FuelEU Maritime reporting, creating a broader compliance ecosystem.
Do both regimes conduct the same CIC campaigns?
They conduct joint CIC campaigns, typically running September to November each year. The 2026 campaign focuses on Cargo Securing. However, individual MOUs may also conduct independent campaigns on specific topics. Results from joint campaigns are shared and contribute to both regimes' targeting databases. Ships calling at ports in either regime during CIC periods should prepare specifically for the campaign topic.
How should I manage PSC performance across both regimes?
Monitor your Ship Risk Profile in both THETIS (Paris MOU) and APCIS (Tokyo MOU) regularly. Track your company performance indices in both regimes separately — they may differ. Ensure deficiencies found in one regime are closed before your vessels call at ports in the other. Use a unified tracking system to maintain consistent compliance standards regardless of trading region, and prepare for region-specific requirements (EU ETS/FuelEU for Europe, port-specific rules for Asia-Pacific).
One Platform, Both Regimes, Complete PSC Visibility
Deficiency tracking, detention history, flag/RO/company performance monitoring, pre-arrival checklists, CIC preparation, EU-specific compliance (FuelEU, EU ETS), and Asia-Pacific port requirements — Marine Inspection unifies PSC management across Paris MOU and Tokyo MOU operations.
