EU MRV Reporting: The Complete Guide for Ship Operators (2026)

1. What is EU MRV?

The EU Monitoring, Reporting and Verification (MRV) Regulation came into force on 1 July 2015 and applies to all commercial ships of 5,000 gross tonnage (GT) and above that call at ports in the European Economic Area (EEA). It is one of the first legally binding measures at EU level specifically targeting maritime CO₂ emissions.

Under EU MRV, ship operators must submit an annual report of CO₂ emissions to the European Commission via the THETIS-MRV system, verified by an independent accredited verifier. The regulation is closely aligned with — but distinct from — the IMO Data Collection System (DCS), which operates at global level.

2. Who must comply?

EU MRV applies to ships of 5,000 GT and above engaged in voyages to, from, or between EU/EEA ports, regardless of flag state. This includes:

• Bulk carriers, tankers, container ships, general cargo, Ro-Ro and passenger vessels
• Both EU-flagged and non-EU-flagged vessels
• Ships operating under time or voyage charter (the shipping company as defined in the regulation is responsible)

3. What must be monitored?

For each ship and reporting period (calendar year), the following data must be monitored:

• CO₂ emitted — per voyage and aggregated per year, per fuel type
• Fuel consumption — per fuel type (HFO, VLSFO, ULSFO, MGO, LNG, methanol, ethanol, etc.)
• Distance travelled — per voyage (nautical miles)
• Time at sea — per voyage
• Transport work — cargo carried × distance (for certain ship types), used to calculate transport efficiency metrics

CO₂ is calculated using emission factors per fuel type (IPCC 2006 guidelines or ISO 14064-1) multiplied by actual fuel consumption.

4. Monitoring plan requirements

Before monitoring begins, each ship must have an approved Monitoring Plan submitted to and approved by an accredited verifier. The plan specifies:

• The monitoring method used (Bunker Delivery Notes, bunker tank monitoring, or flow meters)
• Emission factors for each fuel type used
• Data sources (voyage data recorder, noon reports, port logs)
• Uncertainty thresholds and data gaps procedures

For most operators, Bunker Delivery Notes (BDNs) are the primary monitoring method, as they are already required under MARPOL and provide a documented record of fuel bunkered.

5. Annual report and verification

Each year, operators must submit an Annual Emissions Report covering the previous calendar year (1 January – 31 December). Key deadlines:

• 31 March — Draft annual report due to verifier
• 30 April — Verified annual report submitted to THETIS-MRV

The report must be verified by an accredited body (class societies such as DNV, Bureau Veritas, Lloyd's Register, etc. are accredited EU MRV verifiers). Verification involves:

• Checking monitoring methodology against the approved monitoring plan
• Cross-referencing fuel consumption data with BDNs, invoices and port records
• Ensuring all port calls in the EEA are captured

6. THETIS-MRV submission

THETIS-MRV is the European Maritime Safety Agency (EMSA) web platform for submitting monitoring plans and annual reports. Key points:

• Access requires registration as a "Shipping Company" in THETIS-MRV
• Monitoring plans are submitted and approved within THETIS-MRV by your accredited verifier
• Annual emissions reports are uploaded as an XML file in the prescribed EMSA format
• THETIS-MRV provides a public register where each ship's verified emissions data is published

VesselComply generates THETIS-MRV-compatible XML exports directly from your fuel logs, eliminating manual data entry.

7. Penalties for non-compliance

EU member states set and enforce penalties, which vary significantly:

• Late or missing reports: fines typically €10,000–€50,000 per vessel per year
• Two consecutive non-compliant years: ships may be issued an expulsion order and refused entry to EU ports until compliance is demonstrated
• False reporting: may constitute fraud under national law in addition to EU penalties

8. How to automate EU MRV

Manual EU MRV is extremely error-prone. Each voyage, each BDN, and each emission calculation must be tracked correctly across an entire calendar year, then reconciled and formatted for THETIS-MRV. Common errors include:

• Missing a port call that technically entered EU waters
• Using incorrect emission factors for a fuel type
• Discrepancies between BDN quantities and tank sounding records

VesselComply automates the entire chain: fuel logs entered by captain or shore staff are automatically cross-referenced with voyage data, emission calculations are performed per IPCC guidelines, and the annual report is generated as a THETIS-MRV XML file ready for verifier sign-off.