Bunker Knowledge Hub
Short, factual guides to the paperwork and rules around marine fuel — what the regulations actually say, without the sales pitch.
Bunker Delivery Note (BDN): what it is and what it must contain
What a Bunker Delivery Note must contain under MARPOL Annex VI, how long it is kept, the MARPOL sample rule, and where eBDN (digital BDN) stands.
Read the guideVLSFO vs LSMGO: the difference, where each is burned, and what it costs
VLSFO (max 0.50% S residual blend) vs LSMGO (max 0.10% S distillate): where each is burned, ECA rules, typical price spread and CO₂ factors.
Read the guideIMO DCS vs EU MRV: two reporting regimes, one set of ship data
IMO DCS and EU MRV compared: which ships are covered, what is reported, annual deadlines, who verifies, and what is published.
Read the guideCII rating explained: what A to E actually means for a ship
How the IMO CII rating works: attained vs required CII, the A–E bands, what a D or E triggers, and the commercial weight the letter carries.
Read the guideMediterranean ECA from 1 May 2025: 0.10% sulphur across the Med
The Mediterranean SOx Emission Control Area took effect 1 May 2025: which waters it covers, which fuels comply, and what it does to bunker planning.
Read the guideThe noon report: the small daily form all compliance is built on
What a ship’s noon report contains, why it exists, and how DCS, MRV, CII, EU ETS and FuelEU figures are all derived from this one daily record.
Read the guidePrefer numbers to prose?
The free calculators put the same rules to work on your own figures — CII, FuelEU, EU ETS and TCE, no sign-up.