After refueling your vessel, you notice that the GM of the vessel is less than the required 0.15 meters. What do you do?
• GM (Metacentric Height) and its relationship with KG (height of center of gravity): higher KG → lower GM; lower KG → higher GM • Free surface effect in slack tanks: how partially filled fuel tanks reduce effective GM • What actions (fuel transfer) do to KG and to the free surface effect
• If GM is too small, do you want the ship’s center of gravity (KG) to move up or down to improve stability? • What happens to free surface effect when tanks are more slack versus pressed full or emptied? • Which option both improves GM and reduces the negative impact of free surface effect?
• Confirm that minimum required GM is 0.15 m in the question, so any option that accepts less is suspect • Identify which actions lower KG (more weight low, less weight high) versus raise it • Check which fuel transfer pattern will reduce free surface (fewer slack tanks, tanks either pressed full or empty) rather than increase it
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