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CII Voyage Adjustments & Exclusions

Apply voyage-level adjustments and exclusions to raw DCS data before computing Attained CII - per MEPC.355(78): ice-class, SAR, safety distance, STS, cargo heating, shuttle tanker, cable-laying, and tanker cargo tank cleaning allowances.

IMOOperationalMEPC.355(78)

Raw voyage totals

Total distance travellednmTotal CO₂t

Exclusions

Excluded distancenmSum of distances qualifying for exclusion (ice navigation, SAR, safety distance after CSR avoidance).Excluded CO₂tCO₂ emitted during the excluded legs.

Adjusted distance

38,000nm

Adjusted CO₂

7,900t

Exclusion share

5.0%

Exclusion within typical range.

Voyage adjustments per MEPC.355(78)

Six categories of adjustment allow distance and CO₂ to be deducted before computing Attained CII:

Ice navigation - distance and CO₂ during voyages with certified ice conditions.
Search-and-rescue (SAR) - vessels responding to distress calls.
Safety / CSR avoidance distance - extra nm sailed to avoid piracy-risk areas.
STS (ship-to-ship) transfer - station-keeping during STS.
Cargo heating - boiler fuel for heating cargo on product tankers.
Shuttle tanker DP - dynamic-positioning fuel at FPSO offload.

After exclusion, apply the CII Attained formula using the ADJUSTED distance and ADJUSTED CO₂ (numerator and denominator both reduced). The ship's DCS return must still include raw totals; adjustments apply only to CII rating assessment.