Confidence Factor

A confidence factor is a weighting used in some port State control targeting algorithms to express how much trust the system places in a ship’s recent inspection record when scheduling the next inspection. It reflects the time since the last inspection and the outcome of prior inspections, so a recently and cleanly inspected ship attracts a lower selection priority. The concept supports risk-based targeting alongside the ship risk profile, which combines flag, recognized organization, company performance, ship type, and age. Targeting tools use these factors to direct limited inspection resources toward higher-risk ships rather than inspecting at random.