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These values are used to describe the performance of the boat based on it's metrics, weight, balast, sail area, hull shape, waterline and so forth.
While it might be helpful to sail in boats with different metrics you can predict the "performance" of a boat if you know what those values correspond to. It's not rocket science, and it is helpful in understanding naval architecture and these factors are what makes some vessels perform in light air, or offshore in heavy weather etc.
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