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Turning Circle - Advance & Tactical Diameter

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Advance and tactical diameter of a ship’s 35° turning circle given length and speed, with IMO A.751 pass criteria check.

Formula

$$ \text{Advance} \leq 4.5 L, \quad \text{TD} \leq 5 L $$

Symbol legend

SymbolMeaningUnitSource
$Advance$Forward distance from track to 90° headingmsea trial
$TD$Tactical diameter at 180° headingmsea trial

Sources

  • IMO A.751(18) / MSC.137(76).