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IMO DCS – Data Collection System

IMO DCS in a nutshell

The data collection for IMO’s fuel data collection system (DCS) started on 1 January 2019. DCS aggregates data such as fuel consumption, distance travelled and hours underway for individual ships of 5,000 GT and above.

Connection between the DCS, CII and SEEMP Part III


The aggregated DCS data forms the basis for the CII (Carbon Intensity Indicator) rating and the SEEMP Part III (Ship Energy Efficiency Management Plan). From 1 January 2023 the SEEMP Part III must be verified and onboard ships of 5,000 GT and above to document their plans to achieve their CII targets. 

Starting in 2024, the CII must be calculated based on the DCS data of the previous year, and then reported to the DCS verifier to be verified together with the aggregated DCS data. The attained CII and the environmental rating (A to E) will then be noted on the DCS Statement of Compliance (SoC), which will be required to be kept on board for five years.

How DNV can help you with DCS

With our extensive experience in providing DCS verification, Emissions Insights analysis and other related customer tools such as the SEEMP Part III Generator, DNV helps you to save time and be best prepared for the current and upcoming compliance challenges.

The Emissions Insights tool allows you to manage your fleet’s DCS data more effectively and identify where you can increase efficiency. For instance, it provides you with the information you need to comply with the DCS Fuel Oil Consumption Report, an overview of your preliminary CII ratings and more. Find out how you can profit from our comprehensive DCS service package.


Our extensive DCS FAQ page provides you with answers to most questions on the IMO DCS.

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EU ETS: Preliminary agreement to include shipping in the EU’s Emission Trading System from 2024

Read the update from 23 January 2023


EEXI and CII requirements taking effect from 1 January 2023

Read the update from 17 January 2023


Decarbonization Plan

A long-term decarbonization strategy to ensure cost-effective fleet compliance.



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CII – Carbon Intensity Indicator

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EEXI – Energy Efficiency Existing Ship Index

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