Navalyze · Container · Ship

COSCO JAPAN

IMO: 9448748
Type: Container ship
Average cargo carried: 62,061 t
Flag (estimated): Singapore
Port of registry: Singapore
Technical efficiency: EEXI 11.12 g CO₂/t·nm

ISM company (DoC holder) in 2025: Seaspan Ship Management Ltd.

Report year

2023 at a glance

From the 2023 THETIS-MRV report. Carries about 64,074 t of cargo on average.

Fuel kg/nm

232

Container median 165 kg/nm (+40%)

CO₂ per transport work (cargo)

11.3

g CO₂/t·nm · Container median 19.4 (−42%)

Average speed

12.7 kn

Container median 13.2 kn (−4%)

Fuel per day at sea

70.6 t/day

Fuel consumed

9,998 t

CO₂ emitted

31,209 t

Distance sailed

43,142 nm

CO₂ ÷ CO₂ per mile

Time at sea

3,399 h

142 days, 39% of the year

Within the container fleet, 2025

Set against all 2,208 container 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 kg/nmThis ship 207 kg/nm · median 177 (+17%)

78.8Ranks 1,323 of 2,208, lowest first302

Average speedThis ship 13.5 kn · median 13.3 (+2%)

9.1Faster than 52% of container ships16.0

CO₂ per transport work (cargo)This ship 10.4 g CO₂/t·nm · median 16.3 (−36%)

7.22Ranks 620 of 2,208, lowest first46.9

Middle 80% of shipsMiddle 50%Container medianThis ship

Where the emissions happen, 2023

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 ports79%
From the EU8%
Into the EU8%
At berth in the EU5%

Fuel burned laden

–

Not reported

CO₂ at berth

1,589 t

5.1% of the ship's CO₂, alongside in EU ports

Methane (CH₄)

–

Mainly from LNG; small for oil, biofuel and methanol

CO₂eq uplift

–

CO₂eq on top of CO₂ alone, from CH₄ and N₂O

Over the years

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

Fuel kg/nm

COSCO JAPAN
Container median

150.0200.0250.0300.0

’182018’212021’222022’232023’242024’252025

Average speed, kn

COSCO JAPAN
Container median

12.013.014.015.0

’182018’212021’222022’232023’242024’252025

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

COSCO JAPAN
Container median

10.012.515.017.520.022.5

’182018’212021’222022’232023’242024’252025

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	−0.1 kn	−17%	−18%	−12%	−7%	Same speed, fuel per mile down 17%; better than speed alone explains (hull, engine or trade).
2023→2024	+0.9 kn	+8%	+15%	+4%	−1%	0.9 kn faster, fuel per mile up 8%; better than speed alone explains (hull, engine or trade).
2022→2023	−0.6 kn	−15%	−19%	+28%	−4%	0.6 kn slower, fuel per mile down 15%; better than speed alone explains (hull, engine or trade).
2021→2022	+1.0 kn	−4%	+5%	+58%	+3%	1.0 kn faster, fuel per mile down 4%; better than speed alone explains (hull, engine or trade).
2018→2021	−2.5 kn	+22%	+1%	+86%	−27%	2.5 kn slower, fuel per mile up 22%; 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	Hours at seah	Average speedknots at sea	Fuel kg/nmthis ship	CO₂ per transport work (cargo)g/t·nm, this ship	Laden fuel
2025	Seaspan Ship Management Ltd.	8,120	25,361	39,218	2,910	13.5	207	10.4	–
2024	Seaspan Ship Management Ltd.	11,164	34,823	44,656	3,287	13.6	250	11.2	–
2023	not published	9,998	31,209	43,142	3,399	12.7	232	11.3	–
2022	not published	9,132	28,938	33,676	2,528	13.3	271	11.7	–
2021	not published	6,000	19,016	21,313	1,737	12.3	282	11.4	–
2018	not published	2,649	8,255	11,476	776	14.8	231	15.5	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Container median	vs Container	Rank	Verifier	Methods
2025	Seaspan Ship Management Ltd.	10.4	16.3	−36%	620 of 2,208	DNV	B+C
2024	Seaspan Ship Management Ltd.	11.2	17.5	−36%	541 of 1,974	DNV	B+C
2023	not published	11.3	19.4	−42%	473 of 1,899	DNV	B+C
2022	not published	11.7	19.1	−39%	465 of 1,825	DNV	B+C
2021	not published	11.4	17.9	−36%	429 of 1,781	DNV	B+C
2018	not published	15.5	20.2	−23%	580 of 1,705	DNV	B+C

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Container 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 container 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.