Navalyze · Cruise · Ship

MARELLA DISCOVERY

IMO: 9070632
Type: Passenger ship (Cruise Passenger ship)
Flag (estimated): Malta
Port of registry: Valletta
Technical efficiency: EEDI 12.01 g CO₂/t·nm

ISM company (DoC holder) in 2025: UK Cruise Charter 1 ltd

Report year

2025 at a glance

From the 2025 THETIS-MRV report.

Fuel kg/nm

297

Cruise median 264 kg/nm (+13%)

CO₂ per transport work (pax)

542

g CO₂/pax·nm · Cruise median 521 (+4%)

Average speed

13.5 kn

Cruise median 13.1 kn (+3%)

Fuel per day at sea

96.1 t/day

Fuel consumed

13,988 t

CO₂ emitted

44,181 t

44,868 t CO₂eq incl. CH₄ and N₂O

Distance sailed

47,138 nm

CO₂ ÷ CO₂ per mile

Time at sea

3,495 h

146 days, 40% of the year

Within the cruise fleet, 2025

Set against all 202 cruise 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 297 kg/nm · median 264 (+13%)

89.6Ranks 121 of 202, lowest first416

Average speedThis ship 13.5 kn · median 13.1 (+3%)

10.8Faster than 56% of cruise ships15.5

CO₂ per transport work (pax)This ship 542 g CO₂/pax·nm · median 521 (+4%)

303Ranks 104 of 202, lowest first1,701

Middle 80% of shipsMiddle 50%Cruise 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 ports66%
From the EU9%
Into the EU7%
At berth in the EU17%

84% of this ship's CO₂ falls under the EU ETS (36,920 t).

Fuel burned laden

11,540 t

83% of all fuel; 18% in ballast or unladen

CO₂ at berth

7,727 t

17.5% of the ship's CO₂, alongside in EU ports

Methane (CH₄)

0.7 t

Mainly from LNG; small for oil, biofuel and methanol

CO₂eq uplift

+687 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 Cruise median is the middle ship of all cruise ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel kg/nm

MARELLA DISCOVERY
Cruise median

200.0250.0300.0350.0400.0450.0

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

Average speed, kn

MARELLA DISCOVERY
Cruise median

7.510.012.515.017.5

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

CO₂ per transport work (pax), g CO₂/pax·nm

MARELLA DISCOVERY
Cruise median

0.0100,000200,000300,000400,000

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

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	+0.9 kn	+15%	+23%	+11%	+17%	0.9 kn faster, fuel per mile up 15%; in line with the speed change.
2023→2024	−1.8 kn	−7%	−19%	+1,019%	−8%	1.8 kn slower, fuel per mile down 7%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2023	+0.6 kn	−13%	−9%	−91%	−23%	0.6 kn faster, fuel per mile down 13%; better than speed alone explains (hull, engine or trade).
2021→2022	+0.3 kn	+5%	+7%	+187%	−43%	0.3 kn faster, fuel per mile up 5%; in line with the speed change.
2020→2021	+5.7 kn	−25%	+30%	−28%	−100%	5.7 kn faster, fuel per mile down 25%; better than speed alone explains (hull, engine or trade).
2019→2020	−5.4 kn	+16%	−32%	−41%	+51,076%	5.4 kn slower, fuel per mile up 16%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	−2.7 kn	+9%	−10%	−19%	+1%	2.7 kn slower, fuel per mile up 9%; 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	UK Cruise Charter 1 ltd	13,988	44,181	47,138	3,495	13.5	297	–	83%
2024	UK Cruise Charter 1 ltd	10,978	34,336	42,514	3,369	12.6	258	–	88%
2023	not published	1,061	3,365	3,800	264	14.4	279	–	88%
2022	not published	13,164	41,670	41,226	2,982	13.8	319	–	81%
2021	not published	4,376	13,812	14,387	1,065	13.5	304	–	–
2020	not published	8,067	25,671	19,848	2,548	7.8	406	–	–
2019	not published	11,813	37,056	33,678	2,552	13.2	351	–	–
2018	not published	13,380	42,817	41,436	2,606	15.9	323	–	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/pax·nm	Cruise median	vs Cruise	Rank	Verifier	Methods
2025	UK Cruise Charter 1 ltd	542	521	+4%	104 of 202	ABS	A+B
2024	UK Cruise Charter 1 ltd	465	686	−32%	1 of 17	ABS	A+B
2023	not published	505	625	−19%	81 of 202	ABS	A+B
2022	not published	652	831	−22%	63 of 187	ABS	B
2021	not published	1,154	1,315	−12%	45 of 100	ABS	B
2020	not published	310,360	1,169	+26,459%	96 of 100	ABS	B
2019	not published	606	589	+3%	92 of 177	ABS	B
2018	not published	598	577	+4%	82 of 153	ABS	B

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