USCG Exam Practice · Vessel stability — metacentric height, free surface
Under 46 CFR §28.570, what is the minimum initial metacentric height (GM) required for a commercial 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) specifies a minimum initial GM of 1.15 feet (0.35 meters) in each condition of loading. Option A is the minimum righting arm (GZ) value at 30°, not the GM requirement.
Cited:46 CFR §28.570
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