Navalyze · Oil tanker · Ship

MARLIN HERA

IMO: 9729221
Type: Oil tanker
Average cargo carried: 35,315 t
Flag (estimated): Marshall Islands
Port of registry: Majuro
Technical efficiency: EEXI 3.85 g CO₂/t·nm
Former names: NORD LARKSPUR

ISM company (DoC holder) in 2025: Optra Shipping Ltd

Report year

2020 at a glance

From the 2020 THETIS-MRV report. Carries about 42,453 t of cargo on average.

Fuel kg/nm

134

Oil tanker median 134 kg/nm (+0%)

CO₂ per transport work (cargo)

9.97

g CO₂/t·nm · Oil tanker median 9.03 (+10%)

Average speed

9.3 kn

Oil tanker median 11.0 kn (−15%)

Fuel per day at sea

29.8 t/day

Fuel consumed

468 t

CO₂ emitted

1,479 t

Distance sailed

3,494 nm

CO₂ ÷ CO₂ per mile

Time at sea

376 h

16 days, 4% 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 kg/nmThis ship 87.8 kg/nm · median 129 (−32%)

76.1Ranks 290 of 1,665, lowest first191

Average speedThis ship 11.2 kn · median 10.7 (+5%)

8.0Faster than 65% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 7.82 g CO₂/t·nm · median 7.95 (−2%)

4.51Ranks 808 of 1,665, lowest first27.7

Middle 80% of shipsMiddle 50%Oil tanker medianThis ship

Where the emissions happen, 2020

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 ports16%
From the EU15%
Into the EU32%
At berth in the EU37%

Fuel burned laden

300 t

64% of all fuel; 36% in ballast or unladen

CO₂ at berth

540 t

36.5% 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 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 kg/nm

MARLIN HERA
Oil tanker median

80.0100.0120.0140.0

’182018’192019’202020’222022’232023’252025

Average speed, kn

MARLIN HERA
Oil tanker median

9.010.011.012.013.0

’182018’192019’202020’222022’232023’252025

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

MARLIN HERA
Oil tanker median

4.06.08.010.0

’182018’192019’202020’222022’232023’252025

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2023→2025	−0.2 kn	−7%	−9%	+175%	+6%	Same speed, fuel per mile down 7%; in line with the speed change.
2022→2023	−0.4 kn	+1%	−3%	+93%	+31%	0.4 kn slower, fuel per mile flat; worse than speed alone explains (fouling, weather, loading or trade).
2020→2022	+2.5 kn	−30%	−11%	+47%	−43%	2.5 kn faster, fuel per mile down 30%; better than speed alone explains (hull, engine or trade).
2019→2020	−1.6 kn	+44%	+23%	−67%	+94%	1.6 kn slower, fuel per mile up 44%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	−1.3 kn	+0%	−11%	+85%	−9%	1.3 kn slower, fuel per mile flat; 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	Optra Shipping Ltd	2,391	7,520	27,230	2,434	11.2	87.8	7.82	–
2023	not published	937	2,926	9,904	870	11.4	94.6	7.39	–
2022	not published	483	1,515	5,137	436	11.8	94.0	5.66	–
2020	not published	468	1,479	3,494	376	9.3	134	9.97	64%
2019	not published	988	3,085	10,639	980	10.9	92.9	5.13	99%
2018	not published	532	1,662	5,746	469	12.2	92.7	5.65	85%

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025	Optra Shipping Ltd	7.82	7.95	−2%	808 of 1,665	DNV	B
2023	not published	7.39	8.44	−12%	726 of 1,797	DNV	B
2022	not published	5.66	8.51	−33%	380 of 1,961	DNV	B
2020	not published	9.97	9.03	+10%	1,047 of 1,870	Bureau Veritas	C
2019	not published	5.13	8.83	−42%	274 of 1,919	Bureau Veritas	C
2018	not published	5.65	8.86	−36%	381 of 1,779	Bureau Veritas	B+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.