Ship-vetting powerhouse RightShip has revised the algorithm behind its greenhouse gas ratings methodology for the first time in more than 10 years.

The main change consists of the influential player’s decision to neutralise the effect of operational measures — mainly engine power limitation (EPL) — from the factors it takes into account when assessing a ship’s environmental performance.

“As these measures can be overridden and are not inherent to ship design, RightShip employs the Admiralty principle to remove the effect of such measures on the rating,” the company said in a statement released on Wednesday.