Container ship · Portugal flag · built 2006

MASTERY D

IMO 9301201 EU ETS7 reporting years

CO₂ reported 2025: 4,191 t
Fuel burned: 1,340 t
Time at sea: 1,538 h
Emitted at berth: 2% of total
Share of year under way: 18%
Gross tonnage: 8,971

MASTERY D — Wolfgang Fricke, CC BY 3.0 · File

Vessel particulars

IMO number: 9301201
Ship type: Container ship
Gross tonnage: 8,971
Length overall: 154.6 m
Year built: 2006
Flag state: Portugal
Builder: Volharding Shipyards
Port of registry: Madeira
Ice class: IA
Technical efficiency (design): EEXI (25.91 gCO₂/t·nm)
Efficiency ranking: Not ranked, under_transportarbeidsgulv (2025)
Verifier: RINA HELLAS LTD, Greece
Accreditation: 1325
Compliance document issued: 2026-03-06
Compliance document expires: 2027-06-30

Flag state is derived from the reported port of registry, not reported directly, and reflects the registry at the time of reporting.

Reported CO₂ by year

Between 2019 and 2025 reported CO₂ fell by 54.4%.

From 2024 to 2025, emissions fell 65.8% and CO₂ per nautical mile rose 4.3%.Distance was not reported for both years, so activity and efficiency cannot be separated here.

Annual returns2019–2025

Year	CO₂ (t)	Fuel (t)	Distance (nm)	At sea (h)	At berth (t)	kg CO₂/nm	EEOI	Percentile
2025	4,191	1,340	—	1,538	64	238.4	42.7	not ranked
2024	12,257	3,927	53,645	4,825	405	228.5	51.6	96
2023	12,375	3,892	56,821	4,880	812	217.8	46.8	91
2022	11,075	3,463	52,166	5,324	327	212.3	57.7	97
2021	14,007	4,414	55,692	4,883	748	251.5	48.1	93
2020	12,946	4,075	48,532	4,715	1,329	266.8	45.2	92
2019	9,196	2,909	—	3,110	993	254.4	63.0	not ranked

Where the 2025 emissions occurred

Methane, nitrous oxide and EU ETS2025

Total CO₂ equivalent: 4,256 t
Methane (CH₄): 0.07 t
Nitrous oxide (N₂O): 0.24 t
Under EU ETS: 3,017 t, 72% of total

Laden voyages2025

CO₂ on laden voyages: 4,191 t, 100% of total
Fuel, laden: 1,340 t
CO₂ per nm, laden: 238.4 kg

The share carried on laden voyages separates productive sailing from ballast legs. For tankers, bulkers and ro-ro vessels that split is the operational question; a low laden share means the ship spent much of the year moving empty.

Verifier history

From reporting year	Verifier	Accredited in
2019	DNV	Germany
2025	RINA HELLAS LTD	Greece

A change of accredited verifier is shown because it matters for audit and data continuity. It is not in itself a sign of anything being wrong.

Sources and how to read this

Emissions: EU MRV publication (THETIS-MRV), reporting years 2019–2025, published by the European Commission.
Vessel particulars: Wikidata (CC0) and Wikimedia Commons.

What this page is built on

Reporting years: 7
Ranked by efficiency: no
Vessel particulars: 5 of 5
Movement data: not observed
Name history: none recorded
Photograph: yes
Sanctions record: none
Inspection record: none in US waters

Caveats that apply to every vessel page

EEOI above 100,000 is withheld. Those values come from returns where reported transport work is near zero, which makes the ratio meaningless rather than extreme. Median across the dataset is around 12.

Emission categories overlap. In the MRV return, emissions at berth are also counted inside the voyage legs, so the categories do not sum to the total. They are shown side by side rather than stacked for that reason.

Distance is derived, intensity is reported. The MRV return publishes CO₂ per nautical mile but not the distance itself, which is null in all 106,564 rows of the source. The distance column is therefore filled from the ranking step, which reconstructs it, and is blank for years where a vessel was not ranked. That is why a row can show an intensity without a distance.

Percentile is within type and year. It is the vessel's position among qualifying ships of the same type that year, where lower is more efficient. A blank means the vessel did not qualify for ranking that year.

Sister ships share a builder, a type and a build year within two years of this vessel. That holds hull and machinery roughly constant and leaves operation as the variable, which is why they are listed before nearest-by-tonnage.

Methane and nitrous oxide start in 2024. They were not reported before that period, so earlier years cannot be compared against them.

Technical efficiency is a design figure fixed at construction. A vessel can hold a good index and still emit heavily by sailing fast, waiting at anchor or carrying little.

Inspection records cover United States waters only. An empty record is not evidence of a clean history elsewhere.

Empty means unreported, never zero. Nothing here is modelled, estimated or interpolated. See the methodology.

Something wrong on this page? See corrections. We do not hold the source registers and cannot amend them, but we will fix anything we have got wrong in reproducing them.