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Ship vetting specialist RightShip has confirmed that it is making "some minor adjustments" to its Greenhouse Gas (GHG) Emissions Rating as part of its commitment to ensure that the rating "reflects the latest outcomes from the IMO working groups, and also responds to industry feedback".

In a statement, RightShip said: "Following a recent review by DNV GL, we are making some minor adjustments to our formula so it more accurately evaluates existing vessels as well as enabling us to apply it to additional vessel types.

"Whilst these will not have a large impact overall, it may cause a slight adjustment to some vessel ratings."

RightShip stated that the updates would take place "over the next few weeks" and would include:

- changes to assumed fuel type for non-verified vessels.
- aligning ship types for comparison of GHG Emissions Rating with recent updates.
- updating the Phase 1 Reference Line comparison.

RightShip developed the GHG Emissions Rating to address the several thousand vessels currently in service that annually emit carbon dioxide emissions into the atmosphere.

RightShip's Existing Vessel Design Index (EVDI) estimates the theoretical amount of carbon dioxide emitted per tonne nautical mile travelled, based on the design characteristics of the ship at the time of build such as cargo carrying capacity, engine power and fuel consumption. While the International Maritime Organization's (IMO) Energy Efficiency Design Index (EEDI) applies to new ships, the EVDI can be used for the existing fleet.

EVDI values are calculated from ship-sourced data as well as RightShip's Ship Vetting Information System (SVIS), IHS Maritime, classification societies, engine manufacturers and yards.

The GHG Emissions Rating is a measure derived from the EVDI that allows relative comparison of a ship's carbon dioxide emissions to vessels of a similar size and type using a simple A - G rating scale.

Image: RightShip's A - G rating scale for its Existing Vessel Design Index (EVDI).