IMO DCS vs EU MRV: two reporting regimes, one set of ship data
A ship trading to Europe usually reports the same year of fuel data twice: globally to the IMO Data Collection System and to the EU’s MRV scheme. The regimes overlap heavily but differ in scope, granularity and publicity.
Scope
IMO DCS covers ships of 5,000 GT and above worldwide, flag-administered. EU MRV covers voyages to, from and between EEA ports: ships of 5,000 GT and above of all types, plus — since 1 January 2025 — general cargo ships of 400–4,999 GT and offshore ships of 400 GT and above.
What is reported
DCS is annual aggregate data: fuel consumption by type, distance travelled, hours underway. MRV is finer: per-voyage fuel, CO₂, distance, time at sea, cargo carried and transport work — and at-berth emissions in EEA ports are reported separately.
Deadlines and verification
DCS: data goes to the flag administration or its RO within three months of year end; the Statement of Compliance is issued by 31 May. Verification is by the flag or its recognised organisation.
MRV: the emissions report is verified by an independent accredited verifier and submitted via THETIS-MRV by 31 March; the Document of Compliance is carried by 30 June. MRV data — unlike DCS — is published, ship by ship.
One data source underneath
Both regimes are fed by the same operational records: bunker delivery notes, tank soundings and daily noon reports. Where the daily data is complete and consistent, both returns are derivable from it without separate bookkeeping — which is exactly how BunkerIstanbul builds its annual DCS pack and per-voyage MRV sheet.
The data behind these rules, handled for you.
BunkerIstanbul prepares EU MRV, IMO DCS, CII, EU ETS and FuelEU figures from the noon reports and BDNs your crew already logs — alongside competing bunker quotes from verified suppliers. Free for shipowners.
Frequently asked questions
Does a 3,000 GT general cargo ship report under both?
Under EU MRV yes (from the 2025 reporting year, if it trades to the EEA) — under IMO DCS no, DCS starts at 5,000 GT. This asymmetry is new since the 2023/957 amendment.
Is MRV data really public?
Yes — annual per-ship CO₂, fuel consumption and efficiency data from THETIS-MRV is published. DCS data stays anonymised at IMO level.
Can one report satisfy both?
No, they are separate submissions to separate systems — but they can be produced from the same underlying voyage and consumption records, which is where the real workload saving is.