Navalyze · Oil tanker · Ship

HTM DEFENDER

IMO: 9346445
Type: Oil tanker
Average cargo carried: 21,828 t
Flag (estimated): Gibraltar
Port of registry: Gibraltar
Technical efficiency: EEXI 4.41 g CO₂/t·nm
Ice class: IA
Former names: AURORA N

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

Report year

2025 at a glance

From the 2025 THETIS-MRV report. Carries about 21,828 t of cargo on average.

Fuel kg/nm

191

Oil tanker median 129 kg/nm (+48%)

CO₂ per transport work (cargo)

27.6

g CO₂/t·nm · Oil tanker median 7.95 (+247%)

Average speed

8.7 kn

Oil tanker median 10.7 kn (−19%)

Fuel per day at sea

40.0 t/day

Fuel consumed

3,778 t

CO₂ emitted

11,940 t

12,126 t CO₂eq incl. CH₄ and N₂O

Distance sailed

19,820 nm

CO₂ ÷ CO₂ per mile

Time at sea

2,265 h

94 days, 26% 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 191 kg/nm · median 129 (+48%)

76.1Ranks 1,499 of 1,665, lowest first191

Average speedThis ship 8.7 kn · median 10.7 (−19%)

8.0Faster than 15% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 27.6 g CO₂/t·nm · median 7.95 (+247%)

4.51Ranks 1,495 of 1,665, lowest first27.7

Middle 80% of shipsMiddle 50%Oil tanker medianThis ship

Where the emissions happen, 2025

THETIS splits each ship's emissions 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 ports76%
From the EU2%
Into the EU4%
At berth in the EU19%

93% of this ship's CO₂ falls under the EU ETS (11,117 t).

Fuel burned laden

–

Not reported

CO₂ at berth

2,234 t

18.7% of the ship's CO₂, alongside in EU ports

Methane (CH₄)

0.2 t

Mainly from LNG; small for oil, biofuel and methanol

CO₂eq uplift

+186 t

+1.6% CO₂eq on top of CO₂ alone, 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 kg/nm

HTM DEFENDER
Oil tanker median

120.0140.0160.0180.0200.0

’182018’192019’202020’222022’242024’252025

Average speed, kn

HTM DEFENDER
Oil tanker median

7.510.012.515.017.520.0

’182018’192019’202020’222022’242024’252025

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

HTM DEFENDER
Oil tanker median

5.010.015.020.025.030.0

’182018’192019’202020’222022’242024’252025

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	−9.9 kn	+47%	−31%	−17%	−0%	9.9 kn slower, fuel per mile up 47%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2024	+7.8 kn	−14%	+48%	+28%	+179%	7.8 kn faster, fuel per mile down 14%; better than speed alone explains (hull, engine or trade).
2020→2022	+1.0 kn	−16%	−8%	+391%	−28%	1.0 kn faster, fuel per mile down 16%; better than speed alone explains (hull, engine or trade).
2019→2020	−0.2 kn	+16%	+14%	−82%	−16%	Same speed, fuel per mile up 16%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	−1.9 kn	−3%	−18%	+174%	+43%	1.9 kn slower, fuel per mile down 3%; worse than speed alone explains (fouling, weather, loading or trade).

Part-year reports are left out of these comparisons. 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	3,778	11,940	19,820	2,265	8.7	191	27.6	–
2024part-year	SPARROW SHIPPING LIMITED	2,050	6,426	16,985	553	30.7	121	38.0	–
2024	Optra Shipping Ltd	3,101	9,743	23,883	1,281	18.6	130	27.7	–
2022	not published	2,834	9,087	18,691	1,730	10.8	152	9.93	–
2020	not published	689	2,185	3,808	387	9.8	181	13.7	–
2019	not published	3,251	10,212	20,924	2,084	10.0	155	16.4	–
2018	not published	1,222	3,842	7,633	643	11.9	160	11.4	–

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	27.6	7.95	+247%	1,495 of 1,665	DNV	B
2024part-year	SPARROW SHIPPING LIMITED	–	–	–	–	DNV	B
2024	Optra Shipping Ltd	27.7	8.06	+244%	1,632 of 1,787	DNV	B
2022	not published	9.93	8.51	+17%	1,186 of 1,961	ICS Verification Services	A
2020	not published	13.7	9.03	+52%	1,354 of 1,870	ABS	B
2019	not published	16.4	8.83	+85%	1,541 of 1,919	ABS	B
2018	not published	11.4	8.86	+29%	1,181 of 1,779	ABS	B

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.