Oil tanker · Bahamas flag · built 2020
ALTERA WAVE: CO₂ emissions 2021–2025
IMO 9863558 MMSI 311000971EU ETS5 reporting years
- CO₂ reported 2025
- 15,399 t
- Fuel burned
- 5,140 t
- Distance
- 29,958 nm
- Time at sea
- 4,213 h
- Emitted at berth
- 11% of total
- Share of year under way
- 48%
- Gross tonnage
- 64,000
ALTERA WAVE against its type
Built in 2020, it is 10 years newer than the median oil tanker on this register, which was built in 2010 (2,896 vessels with a known build year). At 64,000 gross tonnage it is larger than 66% of the other 2,841 oil tankers with a recorded tonnage. It is one of 180 oil tankers here under the Bahamas flag, 5.1% of the 3,548 on the register. The same builder is recorded for 563 other vessels here, 217 of them oil tankers. Its MRV returns name it ALTERA WAVE for 2021–2024 and MARAN WAVE for 2025. The reported port of registry changed: Stavanger (2021–2022), then Nassau (2023–2025).
Its 15,399 t of CO₂ for 2025 is 1.9 times the median of 7,922 t among the 1,704 oil tankers on this register that reported for 2025. Per nautical mile it emitted 514.0 kg CO₂, 27% above the type median of 403.2 kg. It logged 4,213 hours at sea against a median of 2,030 hours for its type that year. 11.0% of its 2025 emissions were at berth; the median for oil tankers was 7.8%. Across 5 years with reported emissions, the highest was 2022 (18,929 t) and the lowest 2024 (13,713 t). Its efficiency percentile within the type went from 91 in 2021 to 88 in 2025 (lower is more efficient). Of the 6 sister ships listed below with a 2025 return, 6 reported a lower CO₂ per nautical mile than this vessel.
Emissions by year2021–2025
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2025 | 15,399 | 5,140 | 29,958 | 4,213 | 1,700 | 514.0 | 17.0 | 88 |
| 2024 | 13,713 | 4,908 | 29,739 | 3,916 | 1,474 | 461.1 | 12.9 | 84 |
| 2023 | 15,589 | 5,327 | 28,134 | 4,607 | 1,672 | 554.1 | 17.6 | 88 |
| 2022 | 18,929 | 6,041 | 32,667 | 4,918 | 1,884 | 579.4 | 15.4 | 86 |
| 2021 | 17,769 | 5,951 | 35,919 | 5,300 | 1,079 | 494.7 | 20.6 | 91 |
Vessel particulars
- IMO number
- 9863558
- Previously reported as
- MARAN WAVE
- MMSI
- 311000971
- Call sign
- C6EQ5
- Ship type
- Oil tanker
- Gross tonnage
- 64,000
- Length overall
- 245.0 m
- Beam
- 44.0 m
- Year built
- 2020
- Flag state
- Bahamas per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Norway. The flag shown is from the newest official source, the EU MRV return for 2025. - Builder
- Samsung Heavy Industries
- Port of registry
- Nassau MRV 2025
- Verifier
- DNV, Germany
- Accreditation
- VS-16026-01
- Compliance document issued
- 2026-02-27
- Compliance document expires
- 2027-06-30
Efficiency against its own type2025
Position 1,282 of 1,448 qualifying oil tankers by EEOI, at the 88th percentile. The dashed line is the type median, 7.5; this vessel reported 17.0.
EEOI divides emissions by transport work, which for this vessel and year was 907,933,962 tonne-miles over 29,958 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 13.3% lower than in 2021, for EU/EEA voyages only.
From 2024 to 2025, emissions rose 12.3% while distance sailed rose 0.7%and CO₂ per nautical mile rose 11.5%.That points mainly to how efficiently it sailed, rather than the other.
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 17,237 t
- Methane (CH₄)
- 58.30 t
- Nitrous oxide (N₂O)
- 0.78 t
- Under EU ETS
- 10,526 t, 68% of total
Observed movementsAIS · Norwegian waters
- First seen
- 20 Sep 2025
- Last seen
- 18 May 2026
- Days observed
- 16
- Positions
- 1,277
- Median speed
- 7.0 kn
Its recorded positions span 58.0°N to 60.0°N and 4.5°E to 9.6°E.
138 hourly points from 1,277 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.
Sources and how to read this
- Emissions: EU MRV publication (THETIS-MRV), reporting years 2021–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0).
- Movements: Norwegian Coastal Administration open AIS extract.
This page draws on 5 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars, AIS movements in Norwegian waters and a name history. Not found in the sources for this vessel: a licensed photograph, 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.