USCG Exam Practice · Vessel stability — metacentric height, free surface
Under 46 CFR Part 28, what is the minimum initial metacentric height (GM) required for a fishing vessel in each condition of loading?
- A0.66 feet (0.2 meters)
- B1.15 feet (0.35 meters)✓ correct
- C1.50 feet (0.46 meters)
- D0.35 feet (0.11 meters)
Why B is correct
46 CFR §28.570(a)(1) requires an initial metacentric height (GM) of at least 1.15 feet (0.35 meters) in each condition of loading. The value 0.66 feet is the minimum righting arm (GZ) required at 30°, not the GM.
Cited:46 CFR §28.570
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