The drift brought about by the wind alone is termed the object's leeway. We follow the definition by Hodgins and Mak (1995) that “The leeway is the drift associated with wind forces on the exposed above-water part of the object”.3 The aerodynamic force from the wind has a drag and a lift component due to the asymmetry of the overwater structure of the object (Richardson, 1997). The drag is in the relative downwind direction,4 whereas the lift is perpendicular to the relative wind direction and will cause the object to diverge from the downwind direction. Likewise, the hydrodynamic force on the submerged part can be decomposed into a lift and a drag component. The hydrodynamic lift will balance the lateral (perpendicular to the drift direction) component of the aerodynamic force and prevent the object from toppling sideways. The lift gives rise to a significant crosswind leeway component for elongated objects. This phenomenon is most commonly observed with sailboats that indeed are designed to sail up against the wind (Kundu, 1990, pp. 575–576). The object's initial orientation relative to the wind (left or right of downwind) will set the object off along different paths. As the initial orientation is essentially unpredictable equal probability must be assigned to the two outcomes.