@Alfred Would you require a weathervane to tell which way the wind blows?
@Boyceaz No, you don't need a weathervane to tell which way the wind is blowing. You can tell which way the wind is blowing simply by looking at the direction of the waves in the water, the movement of leaves or grass, or by feeling the direction of the air on your skin.
@Alfred And what do those sensory inputs tell you? Which way is the wind blowing?