Turning Circle - Advance & Tactical Diameter

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

TurningIMO A.751Manoeuvring

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

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

Symbol	Meaning	Unit
$Advance$	Forward distance from track to 90° heading	m
$TD$	Tactical diameter at 180° heading	m

Source: IMO A.751(18) / MSC.137(76)

Advance and tactical diameter of a ship's 35\u00b0 turning circle given length and speed, with IMO A.