Documentation Index
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Overview
Correct reporting of STS operations, ice navigation and emergency periods is required for the shore system to apply the appropriate CII correction factors. Missing or incorrect flags forfeit the allowance.Regulatory Background
Corrections defined in MEPC.355(78):| Parameter | What it covers |
|---|---|
| FC_voyage,j | Mass (g) of fuel type j consumed during voyage periods deductible when encountering MARPOL Annex VI Reg. 3.1 scenarios (safety emergencies) or sailing in ice conditions |
| AF_Tanker | Correction factor for tankers engaged in STS voyages — applicable to all fuel consumed in relation to the STS voyage including cargo transfer, transit, waiting at anchor or drifting, and port discharge after the STS voyage |
STS Operations
A tanker engaged in an STS operation is eligible to apply a CII allowance to CO₂ emitted before, during, and after the STS operation.How to Flag an STS Period
The STS Operation field in the VOYAGE section is used to flag the STS period. Set it to Yes only when the vessel is actively performing STS operations during the report period.| Report type | Where to set the flag |
|---|---|
| In-Port Noon Report | VOYAGE section → STS Operation = Yes |
| Departure Report | VOYAGE section → STS Operation = Yes |
During STS operations underway, report the distance moved even if the vessel’s Main Engine is not in use.
STS Flowchart
Ice Navigation
The CII allowance for “Time in Ice” applies when an ice-classed vessel is sailing in a sea area within the ice edge. The ice edge is defined by WMO Sea-Ice Nomenclature (March 2014) as the demarcation between open sea and sea ice of any kind (fast or drifting).Reporting Ice Navigation by Report Type
In-Port Noon, Arrival, and Departure Reports
Use the Within Ice Edge field at the top of the VOYAGE section to flag the period in ice.The NAVIGATING IN ICE event must not be used in In-Port Noon, Arrival, or Departure reports. Use the Within Ice Edge flag instead.
At-Sea Noon Report
Create a NAVIGATING IN ICE event. The event must record:- Start and end time of the ice navigation period
- Distance covered during the period
- Fuel consumption during the period
Ice Navigation Flowchart
Emergencies
CII adjustment is available for emergency scenarios specified in MARPOL Annex VI Regulation 3.1 that may endanger safe navigation. All emergency periods must be supported by appropriate deck Logbook entries. There are two event types for emergency periods:| Event Type | Use for |
|---|---|
| NAVIGATING TO REFUGE PORT | Seeking shelter from weather; deviation to refuge port due to engine failure or vessel damage; deviation to evacuate a sick or injured crew member |
| SAR/PIRACY | Navigating at higher speed through piracy areas; Search and Rescue operations |