Apparent wind

Wind experienced by a moving object V = boat speed, H = head wind, W = true wind, A = apparent wind, α = pointing angle, β = angle of apparent wind Apparent wind is the wind experienced by a moving object. Definition of apparent wind The apparent wind is the wind experienced by an observer in motion and is the relative velocity of the wind in relation to the observer.[citation needed] The velocity of the apparent wind is the vector sum of the velocity of the headwind (which is the velocity a moving object would experience in still air) plus the velocity of the true wind. The headwind is the additive inverse of the object's velocity; therefore, the velocity of the apparent wind can also be defined as a vector sum of the velocity of the true wind minus the velocity of the object.[citation needed] Apparent wind in sailing In sailing, apparent wind is the speed and direction of wind indicated by a wind instrument (anemometer) on a moving craft (on water, land or ice) in undisturbed air. It is composed of the combined speeds and directions of the craft and wind observed by a stationary wind instrument—the true wind. A true wind coming from the bow increases the apparent wind induced