Vehicle carrier · Marshall Islands flag · built 2010
POLARIS LIBERTY: CO₂ emissions 2018–2025
IMO 9407689 MMSI 248131000EU ETS7 reporting years
- CO₂ reported 2025
- 14,517 t
- Fuel burned
- 4,554 t
- Distance
- 57,963 nm
- Time at sea
- 4,821 h
- Emitted at berth
- 5% of total
- Share of year under way
- 55%
- Gross tonnage
- 20,209
POLARIS LIBERTY against its type
Built in 2010, it is 2 years newer than the median vehicle carrier on this register, which was built in 2008 (595 vessels with a known build year). At 20,209 gross tonnage it is smaller than 97% of the other 571 vehicle carriers with a recorded tonnage. It is one of 62 vehicle carriers here under the Marshall Islands flag, 8.7% of the 713 on the register. Its MRV returns name it VIKING CONSTANZA for 2018–2022 and POLARIS LIBERTY for 2023–2025. The reported port of registry changed: Singapore (2018–2020), then Majuro (2021–2025).
Its 14,517 t of CO₂ for 2025 is 2.1 times the median of 7,074 t among the 514 vehicle carriers on this register that reported for 2025. Per nautical mile it emitted 250.4 kg CO₂, 19% below the type median of 309.1 kg. It logged 4,821 hours at sea against a median of 1,639 hours for its type that year. 4.7% of its 2025 emissions were at berth; the median for vehicle carriers was 3.1%. Across 7 years with reported emissions, the highest was 2024 (19,228 t) and the lowest 2020 (5,213 t). Its efficiency percentile within the type went from 98 in 2018 to 99 in 2025 (lower is more efficient). Of the 6 comparable vessels listed below with a 2025 return, 6 reported a lower CO₂ per nautical mile than this vessel.
Emissions by year2018–2025
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2025 | 14,517 | 4,554 | 57,963 | 4,821 | 683 | 250.4 | 235.6 | 99 |
| 2024 | 19,228 | 6,127 | 76,880 | 5,873 | 304 | 250.1 | 172.9 | 97 |
| 2023 | 13,690 | 4,585 | 61,935 | 5,339 | 570 | 221.0 | 159.2 | 96 |
| 2022 | 15,431 | 5,289 | 67,963 | 5,580 | 477 | 227.1 | 206.8 | 98 |
| 2021 | 18,431 | 5,865 | 83,408 | 6,326 | 1,641 | 221.0 | 202.0 | 97 |
| 2020 | 5,213 | 1,653 | — | 2,011 | 273 | 244.6 | 346.8 | not ranked |
| 2018 | 10,670 | 3,413 | 40,164 | 3,181 | 867 | 265.7 | 236.5 | 98 |
Vessel particulars
- IMO number
- 9407689
- Previously reported as
- VIKING CONSTANZA
- MMSI
- 248131000
- Call sign
- 9HA6525
- Ship type
- Vehicle carrier
- Gross tonnage
- 20,209
- Length overall
- 140.0 m
- Beam
- 22.0 m
- Year built
- 2010
- Flag state
- Marshall Islands per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Malta. The flag shown is from the newest official source, the EU MRV return for 2025. - Port of registry
- Majuro MRV 2025
- Ice class
- IC
- Technical efficiency (design)
- EEXI (36.91 gCO₂/t·nm)
- Verifier
- DNV, Germany
- Accreditation
- VS-16026-01
- Compliance document issued
- 2026-03-21
- Compliance document expires
- 2027-06-30
Efficiency against its own type2025
Position 420 of 423 qualifying vehicle carriers by EEOI, at the 99th percentile. The dashed line is the type median, 51.7; this vessel reported 235.6.
EEOI divides emissions by transport work, which for this vessel and year was 61,611,578 tonne-miles over 57,963 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 36.0% higher than in 2018, for EU/EEA voyages only. No return is recorded for 2019, so the series has gaps.
From 2024 to 2025, emissions fell 24.5% while distance sailed fell 24.6%and CO₂ per nautical mile rose 0.1%.That points mainly to how much the vessel sailed, rather than the other.
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 14,741 t
- Methane (CH₄)
- 0.23 t
- Nitrous oxide (N₂O)
- 0.82 t
- Under EU ETS
- 13,297 t, 92% of total
Observed movementsAIS · Norwegian waters
- First seen
- 19 May 2026
- Last seen
- 26 Jun 2026
- Days observed
- 17
- Positions
- 1,530
- Median speed
- 14.0 kn
Its recorded positions span 58.0°N to 59.9°N and 8.7°E to 10.8°E.
210 hourly points from 1,530 positions. Filled circle first, open circle last; squares are ports for orientation, not calls.
Positions recorded per month
Norwegian Coastal Administration open AIS, Norwegian waters only, 01 Jul 2025 to 27 Jul 2026. A gap means the vessel was not recorded here, not that it was idle or that a transponder was off.
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2018 | VERIFAVIA (UK) LTD | United Kingdom |
| 2020 | NORMEC VERIFAVIA SAS | France |
| 2021 | DNV | Germany |
A change of verifier is not in itself a sign of anything being wrong.
Sources and how to read this
- Emissions: EU MRV publication (THETIS-MRV), reporting years 2018–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0) and Wikimedia Commons.
- Movements: Norwegian Coastal Administration open AIS extract.
This page draws on 7 MRV reporting years, an efficiency ranking, 4 of 5 vessel particulars, AIS movements in Norwegian waters, a name history and a licensed photograph. Not found in the sources for this vessel: a sanctions listing and US port state inspections.
Empty means unreported, never zero. How EEOI, distance, percentiles and sister ships are handled is explained under reading a vessel page. Something wrong? See corrections.