Navalyze · Oil tanker · Ship

COBALT SUN

IMO: 9814428
Type: Oil tanker
Average cargo carried: 52,812 t
Port of registry: Monrovia
Technical efficiency: EEDI 2.97 g CO₂/t·nm

ISM company (DoC holder) in 2025: Zodiac Maritime Ltd · part of Zodiac

Report year

2025 at a glance

From the 2025 THETIS-MRV report. Carries about 52,812 t of cargo on average.

Fuel per mile

113.1 kg/nm

Oil tanker median 128.5 kg/nm (−12%)

CO₂ per transport work (cargo)

6.76

g CO₂/t·nm · Oil tanker median 7.95 (−15%)

Average speed

9.3 kn

Oil tanker median 10.7 kn (−13%)

Fuel per day at sea

25.1 t/day

Fuel consumed

5,654 t

CO₂ emitted

17,846 t

18,124 t CO₂eq incl. CH₄ and N₂O

Distance sailed

49,987 nm

CO₂ ÷ CO₂ per mile

Time at sea

5,404 h

225 days, 62% of the year

Within the oil tanker fleet, 2025

Set against all 1,665 oil tanker ships with a full-year 2025 report. Bigger ships burn more per mile but less per tonne of cargo, so read fuel per mile with the ship's size in mind.

Fuel per mileThis ship 113.1 kg/nm · median 128.5 (−12%)

76.1Ranks 556 of 1,665, lowest first190.8

Average speedThis ship 9.3 kn · median 10.7 (−13%)

8.0Faster than 19% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 6.76 g CO₂/t·nm · median 7.95 (−15%)

4.51Ranks 598 of 1,665, lowest first27.66

Middle 80% of shipsMiddle 50%Oil tanker medianThis ship

Where the emissions happen, 2025

THETIS splits each ship's CO₂ by voyage type. The split sets how much falls under the EU ETS: all of it within the EU and at berth, half of it on voyages into or out of the EU.

Between EU ports5%
From the EU33%
Into the EU47%
At berth in the EU14%

60% of this ship's CO₂ falls under the EU ETS (10,658 t).

Fuel burned laden

55%

45% in ballast or unladen

CO₂ at berth

14.1%

Alongside in EU ports

Methane (CH₄)

0.3 t

Mainly from LNG; small for oil

CO₂eq ÷ CO₂

1.016

Uplift from CH₄ and N₂O, counted in full from 2026

Over the years

Full-year reports only. The Oil tanker median is the middle ship of all oil tanker ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel per mile, kg/nm

COBALT SUN
Oil tanker median

110.0120.0130.0140.0150.0

’192019’202020’212021’222022’242024’252025

Average speed, kn

COBALT SUN
Oil tanker median

8.09.010.011.012.0

’192019’202020’212021’222022’242024’252025

CO₂ per transport work (cargo), g CO₂/t·nm

COBALT SUN
Oil tanker median

0.02.55.07.510.0

’192019’202020’212021’222022’242024’252025

Year on year

Year	Speed	Fuel per mile	Fuel per day	Distance	CO₂ per TW	Reading
2024→2025	−0.7 kn	−3%	−10%	+66%	+26%	0.7 kn slower, fuel per mile down 3%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2024	−0.7 kn	−10%	−15%	−30%	−29%	0.7 kn slower, fuel per mile down 10%; in line with the speed change.
2021→2022	+0.0 kn	+5%	+4%	+5%	+40%	Same speed, fuel per mile up 5%; in line with the speed change.
2020→2021	+2.2 kn	−13%	+9%	+69%	+431%	2.2 kn faster, fuel per mile down 13%; better than speed alone explains (hull, engine or trade).
2019→2020	−3.3 kn	+4%	−25%	+24%	+15%	3.3 kn slower, fuel per mile up 4%; worse than speed alone explains (fouling, weather, loading or trade).

Fuel per mile rises roughly with the square of speed for a given ship, so a change in speed explains much of a change in fuel per mile.

Every reporting year

One row per THETIS-MRV report. A ship that changed operator during a year has a part-year report for each.

Operation

Year	ISM company	Fuel t	CO₂ t	Distance nm	At sea h	Speed kn	Fuel kg/nm	CO₂ g/t·nm	Laden fuel
2025	Zodiac Maritime Ltd	5,654	17,846	49,987	5,404	9.3	113.1	6.76	55%
2024	Zodiac Maritime Ltd	3,510	11,005	30,196	3,015	10.0	116.2	5.38	62%
2022	not published	5,549	17,450	42,997	4,033	10.7	129.1	7.60	–
2021	not published	5,038	15,869	40,922	3,819	10.7	123.1	5.42	–
2020	not published	3,430	10,780	24,198	2,842	8.5	141.7	1.02	–
2019	not published	2,659	8,358	19,439	1,646	11.8	136.8	0.89	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025	Zodiac Maritime Ltd	6.76	7.95	−15%	598 of 1,665	ABS	C
2024	Zodiac Maritime Ltd	5.38	8.06	−33%	359 of 1,787	ABS	C
2022	not published	7.60	8.51	−11%	814 of 1,961	DNV	C
2021	not published	5.42	8.86	−39%	308 of 1,789	DNV	C
2020	not published	1.02	9.03	−89%	17 of 1,870	Lloyd's Register	C
2019	not published	0.89	8.83	−90%	25 of 1,919	Lloyd's Register	C

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Oil tanker ships are benchmarked on CO₂ per transport work (cargo) (TW), in g CO₂/t·nm. CO₂eq adds methane and nitrous oxide and is in the public files from 2024. Rank counts from the lowest figure among that year's oil tanker ships. Methods: A delivery notes, B tank monitoring, C flow meters, D direct measurement. FuelEU GHG intensity is not shown: it needs fuel types, which the public file does not carry. Operators are named only from 2024, the first year the public files carry them; earlier years belong to the ship, not to any company.