What Is the IMO Data Collection System?
The IMO Data Collection System for fuel oil consumption of ships was established through Resolution MEPC.278(70). It is codified in MARPOL Annex VI Regulation 22A. It is the first step in the International Maritime Organization's three-phase strategy to address greenhouse gas emissions from international shipping. The three phases are data collection, data analysis, and evidence-based decision-making.
The system has been in operation since January 1, 2019. It applies to all ships of 5,000 gross tonnage and above on international voyages, regardless of flag.
Under the IMO DCS, ships must collect data on annual fuel oil consumption by type. They must also collect total hours underway and total distance travelled. This data is reported to the ship's flag state administration. The flag state verifies it and issues a Statement of Compliance.
The flag state then sends the anonymized, aggregated data to the IMO's Global Integrated Shipping Information System (GISIS) database. There it is used to build a full picture of the global fleet's fuel consumption and emissions patterns.
The IMO DCS was created because effective emissions regulation needs a solid data foundation. Before the DCS, there was no standard global way to collect fuel consumption data from the world's merchant fleet.
The data now in the GISIS database has already helped shape the CII and EEXI frameworks. It continues to support the IMO's work on market-based measures and lifecycle carbon assessments for marine fuels.
Data Points and Reporting Process
Under the IMO DCS, ships must collect three kinds of data throughout each calendar year. First, record total fuel oil consumption and break it down by fuel type. Typical fuels are heavy fuel oil (HFO), very low sulphur fuel oil (VLSFO), marine diesel oil (MDO), marine gas oil (MGO), and liquefied natural gas (LNG).
Second, track total hours underway, which is the time the ship spends in transit between ports. Third, record total distance travelled in nautical miles.
Together, these three dimensions make it possible to calculate fuel efficiency metrics and carbon intensity indicators.
Each ship must carry a Ship Fuel Oil Consumption Database Plan. The plan describes how the ship collects and records the required data. The flag state or a recognized organization must approve it, and it must be kept on board for inspection.
At the end of each calendar year, the collected data is compiled into a report. The report goes to the flag state within the prescribed time. The flag state reviews it and, if satisfied, issues a Statement of Compliance. The ship must carry this on board along with the previous year's statement.
The reporting process is designed to be simple. But the quality of the data depends entirely on steady, disciplined collection throughout the year. Gaps in noon reporting, inaccurate bunker delivery records, or inconsistent distance logging can weaken the integrity of the annual report.
Automated data collection platforms like Navatom address this problem. They capture the required data points as a natural byproduct of daily work. This way the DCS report is based on complete and accurate records.
IMO DCS vs EU MRV
The IMO DCS and the EU MRV regulation are often compared because they both collect fuel consumption and emissions data from ships. However, they differ in several important respects.
The IMO DCS is global in scope. It applies to all ships on international voyages. The EU MRV is regional. It applies specifically to ships calling at EU/EEA ports. The IMO DCS collects aggregated annual data, while the EU MRV needs data for each voyage.
The EU MRV also asks for reports on cargo carried and transport work. The IMO DCS does not mandate these data points.
The verification mechanisms also differ. Under the EU MRV, an accredited verifier must assess the annual emissions report before the ship receives its document of compliance. The verifier is an independent third party.
Under the IMO DCS, the flag state administration or a recognized organization acting on its behalf does the verification. The EU MRV verification process is generally seen as more rigorous. The accredited verifier must assess data quality, methodology adherence, and the monitoring plan itself.
Ship operators trading in European waters must comply with both frameworks. The fuel consumption and voyage data is largely the same. But the reporting format, granularity, and submission process differ.
Managing both obligations through a single platform eliminates the risk of inconsistencies between DCS and MRV reports. The data from both systems also feeds into the CII rating system. That system uses fuel consumption and distance data to calculate each vessel's operational carbon intensity.
How Navatom Automates IMO DCS Reporting
Navatom builds IMO DCS reporting into the daily workflows that ships already follow. Logbooks captures fuel consumption from the daily fuel consumption reports and the bunkering records with their delivery notes.
Hours underway and distance travelled come from the Voyage module's position reporting and voyage log records. This data is collected as part of normal ship operations. So DCS compliance adds no workload for the crew. The report is assembled automatically from data that already exists in the system.
Navatom validates data quality throughout the year. It checks for gaps in reporting, unusual consumption figures, and inconsistencies between fuel records and voyage records. Alerts notify shore-based managers when it finds a data quality issue. Managers can then fix the issue promptly, rather than find it at the end of the year during report compilation.
This continuous checking greatly reduces the risk of flag state queries or requests for clarification.
When the calendar year ends, Navatom aggregates all collected data into the annual DCS report format that the flag state or recognized organization asks for. The Certificates module tracks the status of each vessel's Statement of Compliance. This includes issue dates, expiry dates, and renewal reminders.
Companies that also report under the EU MRV use the same data for both reports. Navatom handles the different aggregation levels, data fields, and submission formats automatically.