Question 2106 Deck Safety

The correct answer is C) the effective beam is increased causing BM to increase. When a vessel has negative GM (metacentric height), it becomes unstable and will seek an angle of loll, which is the angle at which the vessel becomes stable again. At the angle of loll, the vessel's effective beam increases, causing the transverse metacentric radius (BM) to increase. This increase in BM offsets the initial negative GM, resulting in a positive GM at the angle of loll. The other options are incorrect because: A) KG (vertical center of gravity) is not reduced at the angle of loll, B) free surface effects are not reduced due to pocketing, and D) the underwater volume of the hull does not increase at the angle of loll.