Which statement is true about the statical stability curve?

The statement that the statical stability curve assumes still water conditions is accurate. The stability curve, which illustrates the relationship between the heeling angle and the righting arm, is developed under the premise of static equilibrium. This means it reflects the vessel's stability characteristics at a single moment in time, without accounting for the dynamic effects of waves, wind, or other forces that might alter stability in real-life scenarios.

In still water conditions, the factors affecting the vessel's stability are generally more predictable and simpler to analyze, making the statical stability curve a useful tool in understanding how a ship will respond to heeling forces. When a vessel is subjected to dynamic conditions such as rolling in waves or influenced by wind, the actual stability can differ significantly from what the statical stability curve indicates.

By focusing solely on still water and static angles of heel, the curve provides essential insight into a vessel's initial stability, but it should not be used as a comprehensive measure of stability in varying sea states or adverse weather conditions. This distinction is critical for safe navigation and risk assessment in maritime operations.