Limit of Positive Stability
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Limit of Positive Stability or LPS is the angle at which a boat will no longer stay upright but will capsize becoming inverted. It is also known as the Angle of Vanishing Stability or AVS. For example, if a boat with an LPS of 120 degrees rolls past this point it will continue to roll and be completely upside down in the water. Most sailboats have lead or other heavy materials in their keel at the bottom of their hulls to keep them from capsizing.
LPS was a part of the Offshore Racing Rules and is used to measure how stable or seaworthy a sailboat is. The modern offshore racing rules published by the International Sailing Federation may also use the measurement.
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