Almost every yachting brochure now has a page about the sea. Very few have a number on it. That gap — between caring about something and measuring it — is where most sustainability work quietly stalls.
Why measurement is the hard part
Cleaning a bay is straightforward. Knowing whether it mattered is not. Without a baseline, a method and a record, a cleanup is an afternoon rather than a data point. The same applies to fuel: “we run efficiently” means nothing until it is litres per guest per mile, tracked across a season.
Three things that make impact measurable
1. A defined unit. Kilograms of waste. Kilometres of coastline. Number of samples. Litres per mile. If you cannot state the unit, you are not measuring.
2. Data that already exists. The most reliable environmental data comes from the operation itself — routes, engine hours, fuel purchases, waste handovers at the marina. Asking crew to fill in an extra form produces data for two weeks and then nothing.
3. A published record. Numbers that stay internal drift. Numbers that get published once a year get checked.
What we do
Blue Voyage Score reduces a passage to a score out of 100 built from route efficiency, fuel consumption, waste handling, single-use plastic and the environmental practices of the marinas used. It is calculated from data the operation already collects.
Clean Sea Missions weigh and sort what comes out of the water. Microplastic sampling is done with university laboratories, so the method is not ours to bend. Everything lands in an annual impact report.
The honest caveat
Measured impact is smaller than claimed impact — always. A season of cleanups is hundreds of kilograms, not tonnes. Publishing the real number is less impressive and considerably more useful, because it is the only kind that can be improved next year.