Steers boat erratically through turns. Over- or understeers turn by more than 15°. Fails to warn passengers of pending change in direction. Drifts by more than 15° after stopping turn. Turns dangerously, digging chine, ventilating, or sliding. Speed drops off excessively (starts or comes off plane) through turn. Does not maintain any lookout before commencing or throughout entire maneuver.