OUPV & 100-Ton Master · Stability
Adding weight high on a vessel raises the center of gravity and:
- AIncreases stability by lowering the metacenter
- BIncreases the righting arm at all angles
- CHas no effect on stability
- DDecreases stability by reducing the metacentric height (GM)✓ Correct
Explanation
Raising G reduces GM (the distance between the center of gravity and the metacenter), which shortens the righting arm and makes the vessel more tender and slower to return upright. Topside icing and overloaded upper decks are classic stability hazards.
Authority: Bowditch, Pub. No. 9 (stability fundamentals)
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