The term 'Change Course, At Sea' can be broken down into four crossword solutions: TACK (4 letters), ALEE (4 letters), YAW (3 letters), and YAWS (4 letters). TACK is a nautical term for the act of turning a sailing vessel into the wind so that it will turn in the opposite direction. ALEE is a nautical term for the side of a ship away from the wind. YAW is a nautical term for the movement of a boat or ship when it veers off course. YAWS is a nautical term for the action of turning a sailing vessel away from the wind so that it will turn in the same direction. Together, these terms describe the process of changing course at sea.