10°/10° Zig-zag Overshoot Check

First and second overshoot angles in a 10°/10° zig-zag manoeuvre per IMO MSC.137(76): first overshoot ≤ 10° for L/V < 10 s, ≤ (5 + L/2V)° otherwise; second overshoot ≤ 25°.

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Formula, assumptions, and limits

\alpha_1 \leq \begin{cases} 10^\circ \& L/V < 10 \ 5 + L/2V \& 10 \leq L/V < 30 \end{cases}, \quad \alpha_2 \leq 25^\circ

Symbol	Meaning	Unit
$L$	LBP	m
$V$	Speed through water	m/s
$\alpha_1, \alpha_2$	Observed first / second overshoot	°

Source: IMO Resolution MSC.137(76)

In short

First and second overshoot angles in a 10\u00b0/10\u00b0 zig-zag manoeuvre per IMO MSC.

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