Sample report: a real ship from the public EU MRV register, worked out without any data from its owner. Every figure is an estimate.

Ship decision report · ESTIMATE

PETER OLDENDORFF

IMO 9464663 · Bulk carrier · Oldendorff Carriers GmbH & Co. KG · 2025 EU MRV year · deadweight 67,600 t (estimated)

Made 2026-11-01 with CarbonKeel

Carbon cost this year€581,055€464,972 if the FuelEU shortfall is pooled

On 2026 rules (100%, with methane and nitrous oxide)€779,875the same year sailed again

Best single option: sail 10% slower€351,073 a yearno one-off cost

1 · What you pay, and why

EU ETS €440,834: 5,186 allowances for 7,409 t CO₂ on EU voyages and at EU berths; 70% of 2025 emissions must be surrendered, by 30 September 2026.
FuelEU Maritime €140,221 as a penalty, or €24,138 if the shortfall is bought from a pool: the fuel used on EU voyages is 91.61 g CO₂e/MJ against a limit of 89.34.
UK ETS €0: no UK domestic voyages are visible in the EU register.
CII rating E (no direct cost; D three years running, or E once, needs a corrective plan). Indicative only: the register covers the ship's EU-related voyages, not its whole IMO year, and the deadweight is estimated.

2 · Your three best options, ranked by money saved a year

Option	Fuel saved	Carbon cost saved	Fuel cost saved	Longer at sea	Saved a year	One-off cost	Pays back	How sure
Sail 10% slower Slow steaming within the charter terms; just-in-time arrival where the port allows it.	688 t	€88,405	€413,052	−€150,384 12.5 more days	€351,073	none	at once	Check ETA Time at sea rises 11%. Charter-party speed warranties and the schedule decide whether it is possible.
Hull and propeller cleaning In-water hull cleaning and propeller polish at a port that allows it.	155 t	€19,905	€93,001	—	€112,906	€37,000	3.9 months	Review first The 4% is a typical fouling loss. Your speed-power reference and noon reports show the real one.
Trim optimisation Sail at the trim that needs least power for the draft, from a trim table.	58 t	€7,466	€34,875	—	€42,341	€5,000	1.4 months	Needs data Needs the ship's trim tables or a trim study; the effect depends on draft and cargo plan.
All three together Computed together: the savings overlap, so they are not the sum of the three.	859 t	€110,333	€515,502	−€150,384	€475,451	€42,000	1.1 months

Fuel at €600/t. A day off hire, or a day longer at sea, at €12,000 (about 113 days at sea a year at 12 knots). One-off costs are typical: cleaning €25,000 plus a day off hire, a trim study €5,000. Allowances €85, pool €110/t CO₂e. Your own costs replace these.

3 · How sure is this?

Verified emissions for the year EU MRV register, 2025 (verifier-reported)
Verifier's EU ETS figure used for the EU ETS bill
Fuel types inferred from the register's CO₂ per tonne of fuel; your bunker delivery notes confirm them
Deadweight estimated from the cargo carried
Hull and propeller reference (sea trial or model test) not provided: the cleaning saving is a typical value
Noon reports or high-frequency data not provided: speed and trim savings are modelled, not measured
Charter-party terms not confirmed: who pays the carbon cost, and how far speed can change

CarbonKeel is not a verifier. Allowances are surrendered, and FuelEU balances settled, on the figures the ship’s verifier accepts.

4 · Turn the estimate into your figures

Send us the ship’s noon reports, the verifier’s emissions report and the sea-trial curve. We recompute every figure on them, reconcile each one against your verifier, and price the options with your own costs. The pilot covers one ship; the fee is agreed on a short call.

Book a pilot call Check another ship How every figure is worked out

Contains data from EMSA THETIS-MRV (2025), published under Article 21 of Regulation (EU) 2015/757. CarbonKeel’s figures are our own calculations from that data and are not endorsed by EMSA or the European Commission. Options are modelled on the public year: main-engine fuel per mile follows (1 + Δv)², auxiliary fuel the time at sea; hull and trim act on main-engine fuel at sea. Rules: Directive 2003/87/EC, Regulation (EU) 2023/1805, SI 2026/392, MARPOL Annex VI Regulation 28.