Deck General · Righting Arm & GZ Curve
The area under the GZ curve between upright and the angle of vanishing stability represents:
- AThe metacentric height
- BThe dynamic stability — the total energy needed to capsize the vessel✓ Correct
- CThe vessel's freeboard in foot-tons
- DThe static righting moment at maximum GZ
Explanation
Dynamic stability is the integral of the GZ curve (foot-tons x radians or meter-tons x radians). It represents the total energy (work) required to capsize the vessel, making it a measure of resistance to wave action and heeling forces.
Authority: Stability & Trim (USCG deck topic)
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