Deck General · Metacentric Height (GM)
If KG equals KM, the vessel's initial stability is:
- APositive — M is above G
- BNegative — M is below G
- CNeutral — G and M coincide, GM equals zero✓ Correct
- DIndeterminate without knowing displacement
Explanation
GM = KM - KG. When KG = KM, GM = 0. The vessel is in neutral equilibrium: it has no righting moment and will remain at whatever angle it is placed without returning to upright or capsizing further.
Authority: Stability & Trim (USCG deck topic)
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