If a light craft isn't completely out of the water or tied to something fixed, then any wave action, however slight, that can make the hull move even slightly will result in the hull slipping lower into the water. Once afloat, it doesn't take much air movement at all to move it a considerable distance. The shape of a shoreline or land around it can affect perceived wind direction down low and very local to the land, as the air flows around everything.
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