Lloyd's Register ECO Notation
LR's ECO descriptive notation - granular add-on tags (A, B, C, S, G, W, BWM, OW) that document specific environmental features rather than a single scoring level. Stacks with ENVIRO+-style peers from other IACS members.
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Formula, assumptions, limits
LR’s ECO notation concatenates the letter tags for which the ship meets the criteria. Example: “ECO(A, B, S, G, BWM)” = five tags met. Each tag is individually surveyable and renewable at class survey.
In short
Build the LR ECO notation string from individual environmental-feature tags (A, B, C, S, G, W, BWM, OW).