Navalyze · General cargo · Ship

BOLTEN SYMI

IMO: 9427380
Type: General cargo ship
Port of registry: Madeira
Technical efficiency: EEXI 7.91 g CO₂/t·nm
Former names: HELEN BOLTEN, SYMI

ISM company (DoC holder) in 2025: Lydia Mar Shipping Co SA

Report year

2025 at a glance

From the 2025 THETIS-MRV report.

Fuel per mile

61.8 kg/nm

General cargo median 35.3 kg/nm (+75%)

CO₂ per transport work (dwt)

12.64

g CO₂/dwt·nm · General cargo median 25.45 (−50%)

Average speed

10.6 kn

General cargo median 9.3 kn (+14%)

Fuel per day at sea

15.7 t/day

Fuel consumed

1,945 t

CO₂ emitted

6,156 t

6,252 t CO₂eq incl. CH₄ and N₂O

Distance sailed

31,452 nm

CO₂ ÷ CO₂ per mile

Time at sea

2,976 h

124 days, 34% of the year

Within the general cargo fleet, 2025

Set against all 2,706 general cargo 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 61.8 kg/nm · median 35.3 (+75%)

17.4Ranks 2,084 of 2,706, lowest first78.8

Average speedThis ship 10.6 kn · median 9.3 (+14%)

7.0Faster than 74% of general cargo ships12.1

CO₂ per transport work (dwt)This ship 12.64 g CO₂/dwt·nm · median 25.45 (−50%)

10.14Ranks 379 of 2,706, lowest first52.37

Middle 80% of shipsMiddle 50%General cargo 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 ports40%
From the EU26%
Into the EU25%
At berth in the EU9%

74% of this ship's CO₂ falls under the EU ETS (4,527 t).

Fuel burned laden

–

Not reported

CO₂ at berth

8.7%

Alongside in EU ports

Methane (CH₄)

0.1 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 General cargo median is the middle ship of all general cargo ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel per mile, kg/nm

BOLTEN SYMI
General cargo median

20.040.060.080.0100.0

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

Average speed, kn

BOLTEN SYMI
General cargo median

9.010.011.012.013.0

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

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

BOLTEN SYMI
General cargo median

0.050.0100150200

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

Year on year

Year	Speed	Fuel per mile	Fuel per day	Distance	CO₂ per TW	Reading
2024→2025	+0.3 kn	−11%	−8%	−12%	−2%	Same speed, fuel per mile down 11%; better than speed alone explains (hull, engine or trade).
2023→2024	+0.1 kn	−3%	−2%	−4%	–	Same speed, fuel per mile down 3%; better than speed alone explains (hull, engine or trade).
2022→2023	−0.7 kn	+4%	−2%	+2%	–	0.7 kn slower, fuel per mile up 4%; worse than speed alone explains (fouling, weather, loading or trade).
2021→2022	−0.1 kn	+11%	+9%	+108%	−5%	Same speed, fuel per mile up 11%; worse than speed alone explains (fouling, weather, loading or trade).
2020→2021	−2.0 kn	+14%	−3%	+92%	−10%	2.0 kn slower, fuel per mile up 14%; worse than speed alone explains (fouling, weather, loading or trade).
2019→2020	+2.8 kn	−15%	+8%	−64%	+30%	2.8 kn faster, fuel per mile down 15%; better than speed alone explains (hull, engine or trade).
2018→2019	+0.9 kn	−8%	+1%	−31%	−35%	0.9 kn faster, fuel per mile down 8%; 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	At sea h	Speed kn	Fuel kg/nm	CO₂ g/t·nm	Laden fuel
2025	Lydia Mar Shipping Co SA	1,945	6,156	31,452	2,976	10.6	61.8	–	–
2024	Lydia Mar Shipping Co SA	2,464	7,719	35,587	3,465	10.3	69.2	12.85	–
2023	not published	2,656	8,350	37,097	3,642	10.2	71.6	14.24	–
2022	not published	2,483	7,812	36,193	3,333	10.9	68.6	12.44	–
2021	not published	1,075	3,380	17,405	1,576	11.0	61.7	13.10	–
2020	not published	492	1,549	9,078	700	13.0	54.2	14.61	–
2019	not published	1,604	5,009	25,098	2,455	10.2	63.9	11.27	–
2018	not published	2,542	8,061	36,522	3,945	9.3	69.6	17.42	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/dwt·nm	General cargo median	vs General cargo	Rank	Verifier	Methods
2025	Lydia Mar Shipping Co SA	12.64	25.45	−50%	379 of 2,706	RINA	A
2024	Lydia Mar Shipping Co SA	12.85	19.25	−33%	337 of 1,111	RINA	A
2023	not published	–	–	–	–	RINA	A
2022	not published	12.44	21.57	−42%	195 of 1,034	ICS Verification Services	A
2021	not published	13.10	159.48	−92%	9 of 72	ICS Verification Services	A
2020	not published	14.61	120.71	−88%	8 of 81	ICS Verification Services	A
2019	not published	11.27	90.12	−87%	6 of 96	Verifavia	A
2018	not published	17.42	72.88	−76%	16 of 87	Verifavia	A

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. General cargo ships are benchmarked on CO₂ per transport work (dwt) (TW), in g CO₂/dwt·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 general cargo 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.