Navalyze · Chemical tanker · Ship

OCTONAUT

IMO: 9340477
Type: Chemical tanker
Average cargo carried: 18,633 t
Flag (estimated): Marshall Islands
Port of registry: Majuro
Technical efficiency: EEXI 7.77 g CO₂/t·nm
Former names: OCTADEN

ISM company (DoC holder) in 2025: SYNERGY NAVIS MARINE PRIVATE LIMITED · part of Synergy Marine

Report year

2020 at a glance

From the 2020 THETIS-MRV report. Carries about 14,376 t of cargo on average.

Fuel kg/nm

69.4

Chemical tanker median 85.7 kg/nm (−19%)

CO₂ per transport work (cargo)

15.2

g CO₂/t·nm · Chemical tanker median 16.2 (−6%)

Average speed

12.0 kn

Chemical tanker median 11.4 kn (+5%)

Fuel per day at sea

19.9 t/day

Fuel consumed

640 t

CO₂ emitted

2,011 t

Distance sailed

9,222 nm

CO₂ ÷ CO₂ per mile

Time at sea

771 h

32 days, 9% of the year

Within the chemical tanker fleet, 2025

Set against all 1,460 chemical 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 78.3 kg/nm · median 79.7 (−2%)

52.8Ranks 683 of 1,460, lowest first111

Average speedThis ship 9.0 kn · median 11.1 (−19%)

8.8Faster than 11% of chemical tanker ships12.4

CO₂ per transport work (cargo)This ship 13.1 g CO₂/t·nm · median 15.0 (−13%)

7.93Ranks 591 of 1,460, lowest first40.2

Middle 80% of shipsMiddle 50%Chemical 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 ports1%
From the EU14%
Into the EU80%
At berth in the EU4%

Fuel burned laden

562 t

88% of all fuel; 12% in ballast or unladen

CO₂ at berth

81 t

4.0% 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 Chemical tanker median is the middle ship of all chemical tanker ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel kg/nm

OCTONAUT
Chemical tanker median

40.060.080.0100.0120.0

’182018’192019’202020’212021’222022’232023’242024’252025

Average speed, kn

OCTONAUT
Chemical tanker median

6.08.010.012.014.0

’182018’192019’202020’212021’222022’232023’242024’252025

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

OCTONAUT
Chemical tanker median

10.015.020.025.030.035.0

’182018’192019’202020’212021’222022’232023’252025

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	−1.9 kn	+18%	−2%	−89%	–	1.9 kn slower, fuel per mile up 18%; worse than speed alone explains (fouling, weather, loading or trade).
2023→2024	−0.3 kn	+23%	+19%	+49%	–	Same speed, fuel per mile up 23%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2023	−0.9 kn	−16%	−22%	+55%	−39%	0.9 kn slower, fuel per mile down 16%; in line with the speed change.
2021→2022	+0.8 kn	−16%	−9%	−57%	−0%	0.8 kn faster, fuel per mile down 16%; better than speed alone explains (hull, engine or trade).
2020→2021	−0.7 kn	+10%	+3%	+346%	+37%	0.7 kn slower, fuel per mile up 10%; worse than speed alone explains (fouling, weather, loading or trade).
2019→2020	+0.2 kn	−23%	−22%	−15%	−46%	Same speed, fuel per mile down 23%; better than speed alone explains (hull, engine or trade).
2018→2019	+4.2 kn	−20%	+24%	−43%	−11%	4.2 kn faster, fuel per mile down 20%; better than speed alone explains (hull, engine 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	SYNERGY NAVIS MARINE PRIVATE LIMITED	344	1,073	4,391	489	9.0	78.3	13.1	–
2024	SYNERGY NAVIS MARINE PRIVATE LIMITED	2,700	8,479	40,697	3,745	10.9	66.3	–	–
2023	not published	1,473	4,653	27,328	2,432	11.2	53.9	12.6	–
2022	not published	1,129	3,567	17,640	1,458	12.1	64.0	20.7	–
2021	not published	3,125	9,892	41,151	3,657	11.3	76.0	20.8	–
2020	not published	640	2,011	9,222	771	12.0	69.4	15.2	88%
2019	not published	983	3,082	10,861	922	11.8	90.5	28.3	66%
2018	not published	2,167	6,841	19,156	2,509	7.6	113	31.7	64%

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Chemical tanker median	vs Chemical tanker	Rank	Verifier	Methods
2025	SYNERGY NAVIS MARINE PRIVATE LIMITED	13.1	15.0	−13%	591 of 1,460	ClassNK	A
2024	SYNERGY NAVIS MARINE PRIVATE LIMITED	–	–	–	–	ClassNK	A
2023	not published	12.6	16.2	−23%	396 of 1,314	ClassNK	A
2022	not published	20.7	16.1	+29%	912 of 1,409	ClassNK	A
2021	not published	20.8	16.7	+24%	878 of 1,343	ClassNK	A
2020	not published	15.2	16.2	−6%	580 of 1,312	Bureau Veritas	C
2019	not published	28.3	17.3	+63%	1,015 of 1,321	Bureau Veritas	C
2018	not published	31.7	17.1	+85%	1,046 of 1,294	Bureau Veritas	C

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