Because a sailboat cannot sail directly into the wind, and traveling straight downwind is usually slow, the shortest sailing distance is rarely a straight line. Thus sailboats tack upwind-the familiar zigzag course-and jibe downwind. A tactician's decision of when to tack and where to go can determine the outcome of a race. Describe the process of tacking a sailboat as the wind shifts direction. Sketch a block diagram depicting this process.