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Turning Circle Advance & Tactical Diameter

IMO MSC.137(76) turning-circle criteria: Advance ≤ 4.5 L and Tactical Diameter ≤ 5 L at 35° rudder angle and service speed.

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Formula, assumptions, and limits

Advance4.5L,Tactical diameter5L\text{Advance} \leq 4.5 L, \quad \text{Tactical diameter} \leq 5 L
SymbolMeaningUnit
LLLength between perpendicularsm
AdvanceAdvanceDistance along original heading to 90° turnm
TacticalDiameterTactical DiameterMax transverse distance at 180° turnm

Source: IMO Resolution MSC.137(76)