Oil tanker · Liberia flag · built 2019

COBALT SUN

IMO 9814428 MMSI 636019387EU ETS6 reporting years

CO₂ reported 2025: 17,846 t
Fuel burned: 5,654 t
Distance: 49,987 nm
Time at sea: 5,404 h
Emitted at berth: 14% of total
Share of year under way: 62%
Gross tonnage: 64,200

Vessel particulars

IMO number: 9814428
MMSI: 636019387
Ship type: Oil tanker
Gross tonnage: 64,200
Length overall: 249.0 m
Beam: 44.0 m
Year built: 2019
Flag state: Liberia
Port of registry: Monrovia
Technical efficiency (design): EEDI (2.97 gCO₂/t·nm)
Verifier: AMERICAN BUREAU OF SHIPPING HELLENIC SINGLE MEMBER LIMITED LIABILITY COMPANY (ABS HELLENIC S.M. LTD), Greece
Accreditation: 1083-2
Compliance document issued: 2026-03-19
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.

Efficiency against its own type2025

Position 588 of 1,448 qualifying oil tankers by EEOI, at the 40th percentile. The dashed line is the type median, 7.5; this vessel reported 6.8.

EEOI divides emissions by transport work, which for this vessel and year was 2,639,936,390 tonn-nmover 49,987 nautical miles.

Reported CO₂ by year

Between 2019 and 2025 reported CO₂ rose by 113.5%. No return is recorded for 2023, so the series has gaps.

From 2024 to 2025, emissions rose 62.2% while distance sailed rose 65.5%and CO₂ per nautical mile fell 2.0%.That points mainly to how much the vessel sailed, rather than the other.

Annual returns2019–2025

Year	CO₂ (t)	Fuel (t)	Distance (nm)	At sea (h)	At berth (t)	kg CO₂/nm	EEOI	Percentile
2025	17,846	5,654	49,987	5,404	2,521	357.0	6.8	40
2024	11,005	3,510	30,196	3,015	909	364.4	5.4	23
2022	17,450	5,549	42,997	4,033	2,199	405.9	7.6	46
2021	15,869	5,038	40,922	3,819	2,128	387.8	5.4	19
2020	10,780	3,430	24,198	2,842	2,719	445.5	1.0	0
2019	8,358	2,659	19,439	1,646	1,638	430.0	0.9	0

Where the 2025 emissions occurred

Methane, nitrous oxide and EU ETS2025

Total CO₂ equivalent: 18,124 t
Methane (CH₄): 0.28 t
Nitrous oxide (N₂O): 1.02 t
Under EU ETS: 10,658 t, 60% of total

Laden voyages2025

CO₂ on laden voyages: 9,851 t, 55% of total
Fuel, laden: 3,129 t
CO₂ per nm, laden: 294.6 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.

Observed movementsAIS · Norwegian waters

First seen: 06 Nov 2025
Last seen: 02 Dec 2025
Days observed: 8
Positions: 362
Median speed: 8.4 kn

79 points sampled hourly from 362 recorded positions. The filled circle is the first observed position, the open one the last. Named squares are ports, shown for orientation; they are not recorded calls.

Positions recorded per month

Norwegian waters only, 01 Jul 2025 to 27 Jul 2026. A gap here means the vessel was not recorded in that area. It is not evidence that the vessel was idle, and not evidence that a transponder was switched off. Voyages elsewhere are outside this dataset.

Verifier history

From reporting year	Verifier	Accredited in
2019	Lloyd's Register Quality Assurance Ltd	United Kingdom
2020	HELLENIC LLOYD'S S.A.	Greece
2021	DNV	Germany
2024	AMERICAN BUREAU OF SHIPPING HELLENIC SINGLE MEMBER LIMITED LIABILITY COMPANY (ABS HELLENIC S.M. 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).
Movements: Norwegian Coastal Administration open AIS extract.

What this page is built on

Reporting years: 6
Ranked by efficiency: yes
Vessel particulars: 4 of 5
Movement data: yes
Name history: none recorded
Photograph: none licensed
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.