For a vessel to undergo CSI verification, a comprehensive 25-question survey needs to be completed. This survey covers key areas such as emissions of carbon dioxide (CO2), nitrogen oxides (NOx), sulfur oxides (SOx), and particulate matter (PM), alongside chemical usage, and water and waste management practices. Additionally, the vessel's Energy Efficiency Operational Indicator (EEOI) must be calculated in accordance with the IMO's guidelines as per MEPC.1/Circ.684. Verification assesses data from the last 12 months to ensure compliance and environmental performance.