Risk Index Outcome = sum over ice-type fractions × (ice-type-specific Risk Index Value). Per IMO MSC.1/Circ.1519.
Formula
$$ RIO = \sum_i (C_i \cdot RIV_i) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $C_i$ | Fraction of each ice type in area | - | ice-chart |
| $RIV_i$ | Risk Index Value for ship class + ice type | - | Circular table |
Sources
- IMO MSC.1/Circ.1519 - POLARIS.