Navalyze · Cruise · Ship

MARELLA DISCOVERY

IMO: 9070632
Type: Passenger ship (Cruise Passenger ship)
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 per mile

296.7 kg/nm

Cruise median 263.6 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 per mileThis ship 296.7 kg/nm · median 263.6 (+13%)

89.6Ranks 121 of 202, lowest first415.6

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 541.90 g CO₂/pax·nm · median 521.02 (+4%)

302.86Ranks 104 of 202, lowest first1,700.54

Middle 80% of shipsMiddle 50%Cruise 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 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

83%

18% in ballast or unladen

CO₂ at berth

17.5%

Alongside in EU ports

Methane (CH₄)

0.7 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 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 per mile, 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	Speed	Fuel per mile	Fuel per day	Distance	CO₂ per TW	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	At sea h	Speed kn	Fuel kg/nm	CO₂ g/t·nm	Laden fuel
2025	UK Cruise Charter 1 ltd	13,988	44,181	47,138	3,495	13.5	296.7	–	83%
2024	UK Cruise Charter 1 ltd	10,978	34,336	42,514	3,369	12.6	258.2	–	88%
2023	not published	1,061	3,365	3,800	264	14.4	279.1	–	88%
2022	not published	13,164	41,670	41,226	2,982	13.8	319.3	–	81%
2021	not published	4,376	13,812	14,387	1,065	13.5	304.2	–	–
2020	not published	8,067	25,671	19,848	2,548	7.8	406.4	–	–
2019	not published	11,813	37,056	33,678	2,552	13.2	350.8	–	–
2018	not published	13,380	42,817	41,436	2,606	15.9	322.9	–	–

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	541.90	521.02	+4%	104 of 202	ABS	A+B
2024	UK Cruise Charter 1 ltd	465.13	686.09	−32%	1 of 17	ABS	A+B
2023	not published	504.99	625.29	−19%	81 of 202	ABS	A+B
2022	not published	651.85	830.76	−22%	63 of 187	ABS	B
2021	not published	1,153.58	1,314.88	−12%	45 of 100	ABS	B
2020	not published	310,360.49	1,168.55	+26,459%	96 of 100	ABS	B
2019	not published	606.46	589.20	+3%	92 of 177	ABS	B
2018	not published	598.45	577.11	+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.