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In page Kayak:

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Primary (sometimes called initial) stability describes how much a boat tips, or rocks back and forth when displaced from level by paddler weight shifts. Secondary stability describes how stable a kayak feels when put on edge or when waves are passing under the hull perpendicular to the length of the boat. For kayak rolling, tertiary stability, or the stability of an upside-down kayak, is also important (lower tertiary stability makes rolling up easier).[citation needed]