Navalyze · Ro-pax · Ship

GNV SIRIO

IMO: 9293404
Type: Ro-pax ship
Flag (estimated): Italy
Port of registry: Genova
Technical efficiency: EEXI 23.07 g CO₂/t·nm
Former names: NURAGHES

ISM company (DoC holder) in 2025: Grandi Navi Veloci Spa

Report year

2023 at a glance

From the 2023 THETIS-MRV report.

Fuel kg/nm

237

Ro-pax median 153 kg/nm (+55%)

CO₂ per transport work (pax)

1,004

g CO₂/pax·nm · Ro-pax median 680 (+48%)

CO₂ per transport work (freight)

94.3

g CO₂/t·nm · Ro-pax median 234 (−60%)

Average speed

19.0 kn

Ro-pax median 16.0 kn (+19%)

Fuel per day at sea

107.8 t/day

Fuel consumed

19,665 t

CO₂ emitted

61,342 t

Distance sailed

83,028 nm

CO₂ ÷ CO₂ per mile

Time at sea

4,378 h

182 days, 50% of the year

Within the ro-pax fleet, 2025

Set against all 408 ro-pax 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 271 kg/nm · median 150 (+80%)

69.3Ranks 397 of 408, lowest first232

Average speedThis ship 19.9 kn · median 15.8 (+26%)

12.0Faster than 83% of ro-pax ships22.3

CO₂ per transport work (pax)This ship 1,400 g CO₂/pax·nm · median 567 (+147%)

66.8Ranks 358 of 408, lowest first1,569

CO₂ per transport work (freight)This ship 0.17 g CO₂/t·nm · median 253 (−100%)

48.6Ranks 16 of 408, lowest first1,247

Middle 80% of shipsMiddle 50%Ro-pax medianThis ship

Where the emissions happen, 2023

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 ports92%
From the EU0%
Into the EU0%
At berth in the EU8%

Fuel burned laden

–

Not reported

CO₂ at berth

4,668 t

7.6% 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 Ro-pax median is the middle ship of all ro-pax ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel kg/nm

GNV SIRIO
Ro-pax median

150.0200.0250.0300.0

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

Average speed, kn

GNV SIRIO
Ro-pax median

14.016.018.020.022.0

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

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

GNV SIRIO
Ro-pax median

0.0100200300

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

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

GNV SIRIO
Ro-pax median

0.05001,0001,500

’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	−0.5 kn	+7%	+4%	+13%	+12,949%	0.5 kn slower, fuel per mile up 7%; worse than speed alone explains (fouling, weather, loading or trade).
2023→2024	+1.4 kn	+7%	+15%	−13%	−99%	1.4 kn faster, fuel per mile up 7%; better than speed alone explains (hull, engine or trade).
2022→2023	+1.5 kn	+6%	+15%	+29%	+125%	1.5 kn faster, fuel per mile up 6%; better than speed alone explains (hull, engine or trade).
2021→2022	−0.2 kn	−2%	−3%	−2%	−8%	Same speed, fuel per mile down 2%; in line with the speed change.
2020→2021	−0.2 kn	+0%	−1%	+2%	−4%	Same speed, fuel per mile flat.
2019→2020	−0.6 kn	+7%	+3%	−12%	−41%	0.6 kn slower, fuel per mile up 7%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	+0.9 kn	+6%	+11%	−6%	+5%	0.9 kn faster, fuel per mile up 6%; in line with the speed change.

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	Grandi Navi Veloci Spa	21,880	69,497	80,874	4,072	19.9	271	–	–
2024part-year	Compagnia Italiana Di Navigazione	15,604	48,792	63,408	3,093	20.5	246	–	–
2024	Grandi Navi Veloci Spa	18,165	56,824	71,834	3,518	20.4	253	–	–
2023	not published	19,665	61,342	83,028	4,378	19.0	237	–	–
2022	not published	14,420	45,037	64,574	3,700	17.5	223	–	–
2021	not published	15,044	46,970	65,842	3,730	17.7	229	–	–
2020	not published	14,687	45,861	64,445	3,596	17.9	228	–	–
2019	not published	15,706	49,045	73,483	3,965	18.5	214	–	–
2018	not published	15,800	49,333	78,104	4,428	17.6	202	–	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/pax·nm	Ro-pax median	vs Ro-pax	Rank	Freight, g CO₂/t·nm	Ro-pax median	vs Ro-pax	Verifier	Methods
2025	Grandi Navi Veloci Spa	1,400	567	+147%	358 of 408	0.17	253	−100%	RINA	A+B
2024part-year	Compagnia Italiana Di Navigazione	–	–	–	–	–	–	–	RINA	–
2024	Grandi Navi Veloci Spa	10.7	547	−98%	26 of 404	5.47	233	−98%	RINA	A+B
2023	not published	1,004	680	+48%	270 of 386	94.3	234	−60%	RINA	A
2022	not published	445	626	−29%	160 of 394	64.6	253	−74%	RINA	A
2021	not published	485	815	−40%	146 of 377	72.4	226	−68%	RINA	A
2020	not published	503	751	−33%	150 of 387	76.5	217	−65%	RINA	A
2019	not published	856	569	+50%	250 of 394	99.6	223	−55%	RINA	A
2018	not published	812	729	+11%	190 of 361	103	184	−44%	RINA	A

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Ro-pax ships are benchmarked on CO₂ per transport work (pax) (TW), in g CO₂/pax·nm, and also per tonne of freight (g CO₂/t·nm freight). CO₂eq adds methane and nitrous oxide and is in the public files from 2024. Rank counts from the lowest figure among that year's ro-pax 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.