The term 'Sails Off Course' can be summarized as a situation in which a boat's sails are no longer aligned with the intended direction of travel. This is often caused by a phenomenon known as yawing, which is when the boat's bow moves from side to side due to wind or waves. Yawing is typically caused by a lack of balance between the sails and the rudder, and can be corrected by adjusting the sails or the rudder.