Zig-Zag Overshoot - IMO Check
First overshoot in a 10°/10° zig-zag manoeuvre compared to IMO A.751 / MSC.137(76) pass limits.
IMO limit
12.9deg
Pass / fail
Pass
Formula, assumptions, and limits
$$\alpha_1 \leq f(L/V)$$
IMO Resolution MSC.137(76) sets first-overshoot limit as 10° (L/V ≤ 10 s), 20° (L/V ≥ 30 s), linear interpolation in between. Second overshoot limit +5° above.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $L/V$ | Length-speed ratio (ship-lengths per second) | s | sea-trial track |
| $\alpha_1$ | First overshoot angle | deg | gyro record |
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