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Polar Code - Safe Speed in Ice

Recommended safe speed in ice per POLARIS / IMO MSC.1/Circ.1519 - speed reduced from open-water speed as RIO score approaches zero.

PolarIceSafe speed
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Formula, assumptions, and limits

RIO=CiRIVi\text{RIO} = \sum C_i \cdot RIV_i
SymbolMeaningUnit
RIORIORisk Index Outcome
CiC_iIce concentration of type itenths
RIViRIV_iRisk Index Value

Source: MSC.1/Circ.1519 - POLARIS